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PAGE 6-14 MIDWEST

MODEL 16-35 Alignment Trimmers

MIllWES'l' RADIO CORP.

A-Bdrrd Trimmer -- AI -tided Trimmer

N, -Bdwad Trimmer - L - Band Trimmer ---7 E -Belad Trimness,

F, SECT/ON

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MIXER SECT/ON-----

REBALANCING Procedure for rebalancing the Midwest 16 - 1935 recei-

ver is as follows:

Tha I.F. Amplifier is designed to onerst e at 456 K.C. Peak the 1st, 2nd and 3rd, I.F. transformers tomaximum A.F. output. Trim small A,V.C, transformer to minimum A.F output. Do not measure A.V.C. as an indication of output. The adjustments screws far the I.F., amplifier will be found in the ton of the I.F. Transformers which may be located from the parts location chart.

After the I.F. amplifier has boen aligned proceed as follows in the sr ocedure of aligning the B.F.. portion of the receiver.

Connect a modern signal generst or to the Antenna and Ground posts. Set wave change switch tothe 'E" band.

Set signal generator to 325 K.C. Rotate dial of re ceiver to 325 K.C, Trímm "E" Ose, trimmer until maximum signal is obtained. Trim the "E" band R.F. and "E" band mixer trimmers until maximum signal is obtained. Set signal genretor to 125 K.C. Rotate dial to 125 K.C. trim "E" band nadder until signal isreceived.

Set wave change switch to the "A" band. Set signal generator to 1400 K.C. Set dial at 1400 K.C. adjuxet the "A" band Osc. trimmer until the signal is received at maximum. Adjust the A.R.F. and "A" band mixer trimmers to maximum output. Set signal saner/ or at 550 K.C. set dial at 550 band K.C. Adjust the A' band Osc. sadder until signal is received Set wave change switch to the "L" band. Set signal gonerst or to 4 Meg. Set dial to 4 Meg. Adjust the "L" band Osc. Trimer until the signal is received at maximum. Adjust the "L" band R.F. and "L"band Mixer trimmers until the signal is received at maximum. Set signal generator to 1600 K.C. and adjust the "L° band nadder until 1 gnal is received.

Set the wave change to the "M" band. Set signal en - orator to 11,5 Meg. Set dial to 11.5 Meg. Adjust the "M" band Osc. trimmer until the signal is received at maximum strength. Adjust the "M" band A.F. and "M" band Mixer trimmers until maximum signal isreceived. No nadder is provided on this band.

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TUBE VOLTAGES

TYPE POSITION PL, TE SCREENSUPP. KATHODE FIL. VOL.J VOLS VOT.PS Vaux Vnr.TS

6D6 R. F. 215 85 2.7 2.7 6.0

6D6 MIXER 210 20 2.2 2.2 6.0

6D6 OSC. 96 96 2.2 2.2 6:0

6D6 1st. Z.F. 190 8.6 2.6 2.6 6.0

6D6 2nd I.F. 215 86 5.0 5.0 6.0

607 AVC. AMP. 190 46 6.0 6.0

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45 OUTPUT 330 60 2.5

45 OUTPUT 330 60 2.5

45 OUTPUT 330 60 2.5

5Z3 nett. 355 volts from Filter Set wave change switch to the "H" bead. Set the signal ALL TESTS MADE SJIi; :ì0Mú1*.`.L TOFU*"

generator to 28 Meg. Set dial to 28 Mag. Adjust the "H" band Osc. voltage 120 trimmer until the signal is received at maximum. Adjust the H per volt meter used for all D.C. band R.F. ana "H" band Mixer trimmers until the maximum signal is received, No naddor is wovided for this band, measurements1000

ohm from ground. Voltage 158 de-

pending on line voltage.

This completes the alignment process.



MONT. -WARD PAGE 6-1

TOP Y/EW O/ JPX SOCK!?

Sept., 1934

MONTGOMERY -«TARD & CO.

1W MOW MY PM'R. JOCKLT

MODELS 62-114,62-116 Schematic,Socket,Parte

oro 'Xe /NO/COTEJ POL FJ OP 4 X.! r JW/TCN.

Part No. Code Capacity Voltage Type

Part. No.

MISCELLANEOUS

ITEM Selling Price

P-80862 P80864 P-81801 P-80888 P-80862

P-1640 Speaker Socket $0.06 P-80988 P-1888 No. 19 Socket .06 P-1965 P-1644. No. 30 Socket .06 P-81800

No.g 34 Socket .06 P-80981 P-á0á21 NMI P-50622 P-50695 P-6172

Plat PReeºcterocAesem. L5 "A" Filter Reactor Assem. L6 Audio Traasformer Assem. T6 Double Filament Reactor Astern. L1 and L2

06

.94

.82

.14

P-80888 P-80945 P-80862 P-80888

P-5178 Dual Filament Reactor Assem. LS and 14 .22 P-81014 P-5222 Single Filament Reactor L10 .18 P-80914 P-6200 Antennp R. F. Transformer Assem. T1 .64 P-80914 P-40488 Can for the above Assem .08 P-81812 Py5170 1st I. F. Assem. Complete with Can T2 .80 P-81807 P-5171 2nd I. F. Assem. Complete with Can T8 1.42 P+81805 P-5169 Oscillator Coil. Complete with Can T4 .46 P-81016 P-40416 Replacement Can for Ose. Coil .04 P-10869 8" Black Drive Cord (V. C. or Switch) .02 P-10870 29" Black Drive Cord (Cond. Drive) .04

"B" POWER UNIT PARTS Selling

Part No. ITEM Price P-2182 Dynamotor Complete with Case and Cover P-2169 Celotex Box and Cover P-5161 "B" Reactor Assem. L8 and P-60680 "A" Choke Coil P -70785B Cable and Plug P-1604 Insulated Terminal P-10191 Rubber Cushion

$12.00 .60

L9 .12 .20 .84 .06 .04

P-98088 R12 200 Ohm 0.2 Wire Wound .08 C18 0.260 mf 200V

P-81047 0.250 mf 200V Condenser Block .58 C20 0.260 mf 209V C21 0.260 mf 200V

Strip

CONDENSERS

Part No. Code Capacity Voltage Type P-80862 Cl 0.050 Mf. 200V Tubular P-80862 C2 0.060 Mf. 200V Tubular

Bc Cie C20

zs-u, (io

. r (zoo y) BLACK BLACK

(zoo r) (aao J B le".zs

ur.254(f BZ U

fORH asJ Cn Cl/

Fig. 3. Four Section Condenser in Power Unit Boot

Selling Price $0.08

.08

Selling Price

C8 0.060 Mf. 200V Tubular .08 C4 0.100 Mf. 200V Tubular C6 85 Mmf. Cap. Part of Ose. Coil Assem. .08 C6 0.260 Mf. 200V Tubular .12 C7 0.050 Idf. 200V Tubular .08 CB 1.500 Mf. 140V Tubular .40 C9 70-140 Mmf. Trimmer .18 C10 60 Mmf. Cap. Part of 2nd I.F. Coil As .08 C11 0.010 Mf. 4.00V Tubular .10 C12 0.260 Mt. 200V Tubular .12 C18 600 Mmf. Moulded .08 C14 0.060 Mf. Tubular .08 C15 0.260 Mf. 200V Tubular .12

JC16 18.00 Mt.l Electrolytic Block 1.22 1C17 16.00 Mf. C22 0.002 Mf. 600V Tubular .10 C28 0.002 Mf. 660V Tubular .10 C24 200 Mmf. Cap. Part of Ant. Assem .08 C25 70 Mmf. Cap. Part of 1st I.F. Coil As .08 C26 45 Mmf. Cap. Part of let I.F. Coil As .08 Three Gang Condenser.... 1.70

RESISTORS

Part No. Code Resistance Wattage Type P -A95104 Rl 100,000 Ohm .2 Carbon $0.08 P -A98308 R2 80.000 Ohm .2 Carbon .10 P -A95104 R8 100,000 Ohm .2 Carbon .08 P -A98602 R4 6,000 Ohm .2 Carbon .1.0 P -B98902 R6 9,000 Ohm .5 Carbon .10 P -A95505 R6 6 Megohm .2 Carbon .08 P- 96012 R7 1 Megohm Volume Control .40 P -A95506 R8 6 Megobm .2 Carbon .08 P -A94603 R9 60.000 Ohm .2 Carbon .08 P -A95104 RIO 100,000 Ohm .2 Carbon .08 P -A95104 Ell 100.000 Ohm .2 Carbon .08

.10

4g

34 `'

s, -$E7.

3

C E OR/7 " 1 lue! SNM[o

sr

+6 RED

`

I®

(332.°.'/ -Çob) (Zº) SPX JOCXETS

%

PWR -lOCXETJ

*? YELLOW

BLACK -r9 BLNCA'

+4 S,PEEN Fig. 2. Location of Tubes and Battery Connections

Selling Price

®John F. Rider, Publisher www.americanradiohistory.com

PAGE 6-2 MONT. -WARD

MODELS 62-114,62-116 Voltage,Resistance Test MONTGOMERY -WARD Alignment ,Data

Replacing Drive Cord Remove chassis from cabinet. Take off the pilot light assembly by lifting off the two

sockets and spring clips. Detach the large pointer by removing the screw at

the center of the dial. Loosen the dial assembly by taking out the two screws

which secure the bottom of this assembly to the chassis. Then lay the complete dial assembly face downward

in front of the chassis. It is not necessary to remov the volume control and Off -On switch collars which hold the indicator cords of these two controls in position.

Turn the drive drum until the opening in this drum is approximately vertical and with the hole at the top

Remove the tension spring and the old drive cord.

See that the eyelet is in the hole in the drive drum Insert one end of the drive cord from

the outside through the hole in the eyelet in the drive drum.

Tie the end of the cord which has been inserted in the hole to one end of the tension spring.

Wrap the cord in a clockwise direction (facing front of chassis) around the drive drum approximately one- half turn.

Then tilt the chassis up on its back panel and bring the cord mentioned in the previous paragraph down to the drive shaft. Wrap it two and one-half times around the drive shaft

Then bring this cord up from the drive shaft and wrap it around the drive drum approximately one and one fifth turns in a clockwise direction until it is up to the hole in this drum as illustrated.

Insert the free end of the cord through the hole in the eyelet and tie it to the end of the tension spring. The end of the spring, when hanging free, should be approximately si4" from the flange of the drum as shown in Fig. 4. Cut off the surplus length of cord after it is knotted.

Then secure the other end of the tens on spring over the spur on the drive drum.

Replace the dial assembly and pointer. Replace the pilot light assembly after which the chas-

sis may be reinstalled in the cabinet.

Voltages at Sockets ANTENNA SHORTED TO GROUND

Type of

Tube Function Fila- ment Volt.

Plate to Neg.

Filament

Screen to Neg.

Filamen

Grid to Neg.

Filament

Normal Plate M. A.

34

30

34

30

1st Detector 2.0 135 55 3.0 ay. 1.90

Oscillator 2.0 75 0.0 3.70

I. F. 2.0 135 70 3.0 ay. 3.00

2nd Detector 2.0 2

65 34 1st A. F. 2.0 140 4.0 2.30-

30 2nd A. F. 2.0 135 8.0 3.10

19 Output 2.0 137 6.0 1.00 per plate

& CO.

Condenser Alignment Misalignment or mistracking of condensers generally

manifests itself as broad tuning and lack of volume at portions or all of the standard wave band. The receivers are all properly aligned at the factory with precision instruments and realignment should not be attempted unless all other possible causes of the faulty operation have -first been investigated and unless the service technician has the proper equipment. A signal generator that will provide accurately calibrated signals over the standard wave band and at the intermediate frequency, and an output meter are required for indicating the effect of adjustments.

First set the signal generator to a frequency of 175 KC. Connect the antenna lead of the lead generator

to the grid of the 1st detector thru a .05 mfd. condenser. The ground lead from the signal generator goes to the ground lead of the receiver. Adjust trimmer condenser C9 on the back panel of the chassis until maximum output is obtained. A non-metallic screw driver should be used in making this adjustment as the I. F. trimmer is at B+ potential.

Next set the signal generator for 1730 KC. Turn the rotor to the full open position. The antenna lead from the signal generator is in this instance connécted to the antenna lead of the receiver. Adjust the trimmer of the oscillator section of the 3 gang condenser until maximum output is obtained. The oscillator section is the one with the cut plate rotor.

Then set the signal generator for 1400 KC and turn the rotor until maximum output is obtained. Adjust the other two trimmers on the gang condenser for maximum output.

To obtain dial scale calibration tune in an 800 KC signal and set the dial pointer at that mark on the dial scale. When calibrated in this manner, the setting will be approximately correct at both ends of the scale.

The use of the cut plate type of condenser eliminates the necessity of a 600 KC padder and no adjustment at this frequency, therefore, is required.

D. C. Resistance of Windings D. C. Re- sistance

Part No. Item Code in Ohms P-5168 Double Tuned Antenna Transformer,

Primaries in series T1 20.1 Double Tuned Antenna Transformer

Secondary Preselector T1 3.3 Double Tuned Antenna Transformer

Secondary Detector T1 3.1 P-5169 Oscillator Grid Coil T4 3.6

Oscillator Plate Coil T4 1.6 P-5170 I. F. Coil Primary T2 89.

I. F. Coil Secondary T2 126. P-5171 I. F. Reactor Coil Plate Winding T3 99.

I. F. Reactor Coil Grid Winding T3 429. P-5172 Double Filament Reactor Assembly

each section L1, L2 Small P-5173 Combined Filament Reactor Assembly

each section L3, L4 Small P-50621 Audio Plate Reactor L5 4940. P-50622 Iron Core Isolating Reactor L6 Small P-50222 Filament Reactor L10 Small P-50625 Audio Transformer Primary T5 1066.

Audio Transformer Secondary (center tap to inside) T5 614.

Audio Transformer Secondary (center tap to outside) T6 666.

P-2124 6" Magnetic Speaker (center tap to inside) 260.

6" Magnetic Speaker (center tap to outside) 300.

©John F. Ritter, Publisher



14OD..6 62-114,62-116 MONTGOMERY -WARD (Si. CO. Wiring Change s,Schernatic

Models 114 and 116 "B" Batteryless Receivers

Method of changing the filament wiring to 6 volt series operation.

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©John F. ?rider, Publisher www.americanradiohistory.com


L:ODEL S 62-114,62-116 Chassis View Of 'hanger, MONTGOMERY -WARD CO. i?ata

rcccow_çAc_rgL__-

_y<jl

T, FomV cesa- w.lff

:/9 PW,e.

1

ry6rlCw $34 /OAF

G

PWL.'. SPK.

f/( 2 CNAWfFJ /N A'/O.«

S30 03C.

óACK OF CNASS.ü' -------reword 02/0"//14L N'/R.WÇ TO OF .fFrPOYED.

0fA10Td NFw M'/R4Wf 719 Air ~AO.

1. Cut the yellow battery lead at the switch and remove 7.

it from the cable. Use this for hook-up wire. ,

2. Disconnect the wife connecting the 2nd A.F. and 19

tube filaments at the 2nd A.F. terminal and ground 8.

if at the lug on the side of the chassis.

3. Remove rear mounting foot.

4. Cut out the bare wire jumpers from the 2nd Det. and

1st A.F. filaments to the plate of the second detector

and replace with a bare wire jumper connecting between

the two filaments only, leaving just the black wire on

the second detector plate.

5. Disconnect that black wire at the condenser block and

connect it to the same lug to which the green wire is

connected on the 1st A.F. filament.

6. At the 1st A.F. tube socket disconnect the black wire

from the filament prong and connect it to the empty

lug on the condenser block.

Extend the lead from the bare wire junction of the

2nd Detector and 1st A.F. filaments to the lug marked

"A." (Do not solder yet).

Remove. filament ground on oscillator tube and extend

the lead so that it can be connected to lug "A." (Do

not solder yet).

9. Connect a 25 ohm .5 watt f 5% resistor between

lugs "A" and "B." (Do not solder lug A).

10. Connect a 25 ohm .5 watt* 5% resistor between lugs

"A" and "C." Note: All 4 connections can now

be soldered to lug A.

11. Cut the green cable wire at the 19 tube socket and

remove it from the cable.

12. Replace the mounting foot and check to

25 ohm resistors are not in a position

bottom plate or other connections.

see that the

to short on the



Schematic ,Parts MONTGOMERY -WARD & CO.

/66 - _ - _ _ / /tpfr. TS //.f

T'

% f `7`

Ij;c'\1 r.

p /co a . a

4ó Rs le --t,

aa

Cs

/

r4

á a

MODELS 62-134,62-134X

606

e000

a

CA

62-139, 62--139X

LE 4s6 K.C.

Aug., 1934

SWITCH

(aa crr.

o

Tir

2. Re ca°T

Caz

CJI

A

Crf

Rif

o

Ra

J

r b e

ó

n

4.7

Ce df

a

Re

4º

76 /4A.F. pr4v'

Re

Cl4

fóCËúCCfKfJ r ,V rJúaccén r r rwínix/w a onrcrc.alwrccrrnvrsaeTWca,TRlJ. S.W. means Short Wave

t000000 i J

/ºf

III Ili

II

--t000 0007 Ì/IÌ

1111

REPAIR PARTS LIST FOR 12 TUBE SUPERHETERODYNE RECEIVER

MISCELLANEOUS Selling Part No. ITEM Price P-5176 Sho. W. and Std. W. Antenna R. F. Transformer

less can Tl, T2 $0.86 P-5241 Sho. W. and Std. W. Interstage R. F.

Transformer less can T8, T4 P-5183 Oscillator Coil Assembly less can T8, T9 P-5246 3rd I. F. Transformer less can T7 P-40433 Cans for the above assemblies P-5248 1st I. F. Trans. & Can Assem. T6 P-5244 2nd I. F. Trans. & Can Assem. T6 P-6190 H. F. Oscillator Tracking Coil 1,3

P-5246 2nd I. F. Pla,te Reactor` L4 P -50650-2B Power Choke L1 P -60658-2B Input Transformer Tí0 P -50642A -2B Output Transformer T11 P -50620-2B Power Transformer 115V 60 Cycle T12 P -50652-2B Power Transformer 116V 25 Cycle T12 P -50651-2B Power Transformer 115-230V 40-60 Cycle 712 P-2025 No. 80 Tube Socket P-1884 No. 42 Tube Socket P-2022 No. 76 Tube Socket P-1886 No. 6D6 Tube Socket P-1637 Speaker Socket P-40445 Tube Shield P-40443 Tube Shield Base P-1925 Speaker P-10320 Glass Crystal P-20876 Crystal Retainer Ring P-2060 Knob, Small P-2062 Knob, Large P-10272 Rubber Chassis Cushion P-20912 Large Double End Pointer P-2101 Band Change Switch P-30456 Small Pointer P-2012 Pilot Light Bulb P-20905 Condenser Shield P-10369 8" Black Drive Cord (V. C. or T. C. Ind.) P-10370 29" Black Drive Cord (Con. Drive).... P-2126 Pilot Light Socket and Clip Assem.... P-70702 Cord and Plug Assem P-30342 Grid Cap Only P-1504 8 Lug Terminal Srip P-1421 Single Lug Terminal Strip

.94

.82

.76 .08

1.04 1.04

.18 '.30

1.06 1.82

.76 8.40 4.52 3.74

.08

.08

.08

.08

.06

.08 .04

5.92 .08 .06 .10 .12 .04 .10 .90 .04 .08. .04 .02 .04 .06 .32 .04 .06 .04

RESISTORS Selling Part No. Code Resistance Wattage Type Price

P-A93141ww R1 140 Ohm Wire Wound $0.08 P -A95204 R2 200,000 Ohm 0.2 Carbon .08 P -A95105 R3 1.0 Megohm 0.2 Carbon .08 P -A94252 R4 2,500 Ohm 0.2 Carbon .08

P-A93401ww P -A95205 P -A96104 P -A94304 P- 96006 P -E94403 P -A95104

P- 98038

P -B95603 P -A96603 P- 97011 P -A95203 P- 98037

J/fAKCR

B.C. means Standard Wave

R5 400 Ohm 0.2 Wire Wound .08 R6 2.0 Megohm 0.2 Carbon .08 R7 100,000 Ohm 0.2 Carbon .08 R8 300,000 Ohm 0.2 Carbon .08 R9 2.0 Megohm & Sw. Vol. Con .60 R10 40,000 Ohm 8.0 Carbon .16 R11 100,000 Ohm 0.2 Carbon .08 R12 4,000 Ohm 2.6 R13 390 Ohm 0.6L Armored Wire R18 128 Ohm 2.6 Wound .38 R19 146 Ohm 8.0 R14 60,000 Ohm 0.5 Carbon .08 R16 60,000 Ohm 0.2 Carbon .08 R16 150,000 Ohm Tone Control .86 R17 20,000 Ohm 0.2 Carbon .08

jR20 4,000 Ohm 4.01 Armored Wire 1R21 6,000 Ohm 2.0J Wound ..._ .34

CONDENSERS Selling Part No. Code Capaçity Voltage Type Price

P-80919 Cl 250 mmf 600V Moulded $0.08 P-2102 C2 3-40 mmf Short Wave Ant. Trimmer .08 P-81076 C3 0.05 mf 200V Tubular .10 P-81111 C4 0.26 mf 200V Tubular .12 P-81117 C6 0.26 mf 200V Tubular .12 P-81056 (C6 6.0 mf 160V Dry Electrolytic :68 1C24 2.0 mf 350V P-2102 C7 3-40 mmf Short Wave Inter. Trimmer .08 P-81076 C8 0.05 mf 200V Tubular .10 P-81076 C9 0.05 mf 200V Tubular .10 P-2103 (CIO 150-250 mmfl Double Trimmer (Part of

1C11 150-260 mmff 1st I. F. Trans.) .28 P-2103 (C12 160-250 mmf Double Trimmer (Part of

1C13 150-250 mmf} 2nd I. F. Trans.) .28 P-1685 C14 40-100 mmf 3rd I. F. Trans. Pri. Trimmer .18 P-81076 C'15 0.06 mf 200V Tubular .10 P-81097 C16 0.10 mf 500V Tubular .14

C17 Integral Part of 3rd I. F. Assem P-81076 C18 0.05 mf 200V Tubular .10 P-81081 C19 36 mmf Wire Capacitor .08 P-2112 C20 300-500 mmf Ose. Std. W. Padding Cond .22 P-2102 C21 3-40 mmf Osc. Sho. W. Trimmer .08 P-81081 C22 35 mmf Wire Capacitor .08 P-81118 C23 0.10 mf 400V Tubular .14 P-81096 C25 0.26 mf 400V Tubular .18 P-81117 C26 25 mf 200V Tubular .12 P-81076 C27 0.05 mf 200V Tubular .10 P-81099 C2$ 0.15 mf 220V AC Tubular .26 P-81068 C29 16 mf 450V Wet Electrolytic .84 P-82000 C30 30 mf 50V Dry Electrolytic .62 P -81039A C31 16 mf 400V Wet Electrolytic .72 P-1685 C32 40-100 mmf Ose. Sho. W. Padding Cond .18- P-80919 C33 250 mmf 600V Moulded .08




I ODELS 62-134,62-134X 62-139,62-139X

Resistance Test, Socket Trimners,Voltage

MONTGOMERY -WARD & CO.

12 Tube A. C. Standard and

Short Wave Superheterodyne Receiver

D. C. Resistance of Windings Following are the D. C. resistances of the various

windings in the chassis. D. C. Re- sistance

Part No. Item Code in Ohms

P-5176 B. C. Antenna Transformer Primary T1 28. B. C. Antenna Transformer Secondary T1 4.9

S. W. Antenna Transformer Primary T2 .3

S. W. Antenna Transformer Secondary T2 Small P-5241 B. C. & S. W. Interstage R. F.

Transformer Primaries in series T4 2.9 B. C. Interstage R. F. Trans. Sec T4 7.8 S. W. Interstage R. F. Trans. Sec T3 Small

P-5243 1st I. F. Transformer Primary T5 4.8 1st I. F. Transformer Secondary T5 4.8

P-5244 2nd I. F. Transformer Primary T6 5.

2nd I. F. Transformer Secondary T6 5.

P-5245 3rd I. F. Transformer Primary T7 12.0 3rd I. F. Transformer Secondary T7 30.0

P-5183 B. C. Oscillator Grid Coil 'f8 3.3 S. W. Oscillator Grid Coil T9 Small S. W. Oscillator Plate Coil TO 0.25

P -50653-2B Audio Input Transformer Primary... . T10 400. Audio Input Transformer Secondary

(Center Top to Inside) TIO 200. Audio Input Transformer Secondary

(center Tap to Outside) TIO 280. P -5064.2A -2B Audio Output Transformer primary

(Center Tap to Inside) T11 300. Audio Output Transformer Primary

(Center Tap to Outside) T11 340. Audio Output Transformer Secondary T11 .4

P -50620-2B Power Trans. (115V 60 Cycles) prim. T12 2.6 Power Transformer (115V 60 Cycles) H. T. Sec. (Center Tap to Inside) T12 150. H. T. Sec. (Center Tap to Outside) T12 165. Power Transformer (115V 60 Cycles) Secondary (80 Filament) Power Transformer (115V 60 Cycles) Secondary A -A (Filament) T12 Small

P -50660-2B Power Choke LI 140. P-5190 H. F. Oscillator Tracking Coil L3 1.2 P-5246 2nd I. F. Plate Reactor L4 57. P-1925 Speaker Voice Coil 1.6

Speaker Field Coil L2 5300.

Type of

Tube

6D6

6D6

76

6D6

6D6

76

76 42 42

80

T12

Voltages at Sockets LINE VOLTAGE - 115

ANTENNA SHORTED TO GROUND

Function

1st Detector

Oscillator

1st I. F.

2nd I. F.

2nd Detector

1st Audio 12river Stage Output Rectifier

Across Fila.

or Heater

6.3

6.3

6.3

6.3

6.3

6.3

6.3 6.3

4.6

Plate to

Cath.

115

260

260

170 235 350 435

Screen to Cathode

105

105

Grid to

Cath.

0.0

2.8

3.2

11.0 18 (3)

38.0

Small

Normal Plate M. A,

8.8

3.3

5.8(1) 7.7(21

8.8

7.2

1.2

26.5 21.0 35.5 Per plate

(1) Switch in Standard Wave position. (2) Switch in Short Wave position (No Signal). (3) Measured across resistor R19.

Fig. 3 Drive Cord Replacement,

3611e rR/M`KR

6RV I6 R6M

V O x x M M .1- Os 1--- M M

( r- 3-- Oi O `O CI Cl

.Q .Q

0q/110. 6.167 RK7

//OP' AC

6000 Mc 7.e/HMfR (-600 KC 7RRlMfR

BOTTOM 4'(/4953/3

04-1",,asc J M 7R fR

Frig =R ; U __AMT SM

TR/MMER

01/ Off Jw?CM i 1M(lóYf C0N71OL

A.1.10ARD 6 J7.17/OR JNOR7MRf 70Nf

JftsoP Jw/ N fA17.M[

\J o O f.htM7/f1Y Of fON7R0(S

Fig. 2 -Location of Tubes, Trimmers and Controls

®John F. Rider, Publisher


MONT. -WARD PAGE 6 -

Intermediate Frequency Adjustment Set the signal generator for 456 K. C. Connect the an-

tenna lead of the signal generator to the grid of the 1st detector through a .05 mfd. condenser. Turn the tuning condenser rotor until the plates are completely out. The ground lead from the signal generator goes to the ground lead of the receiver. The volume control should be at the maximum position. Reduce the signal so that A. V. C. action is not obtained.

Then adjust the five I. F. trimmer condensers until maximum output is obtained. The adjusting screws for the 1st and 2nd trimmer condensers are reached from the top of the chassis and are in the round I. F. cans-See Fig. 2. The openings to these trimmer condensers are covered over by small cover plates which are held in position by screws. Loosen these screws until the cover plates can be swung around. CAUTION - Use an insulated screwdriver for adjust ng trimmers to prevent short cir- cuiting to ground. In the 3rd I. F. coil, only the primary has a variable trimmer condenser. This condenser is mounted on the top panel of the chassis as shown in Fig. 2 and the adjustment screw is reached through a hole in the top panel.

Standard Wave Band Adjustment The standard -short wave switch should be in the stand-

ard wave position. Set the signal generator for 1740 K. C. Turn the rotor to the full open position.` The antenna lead from the signal generator is in th's instance connected to the antenna lead of the receiver. Reduce the signal so that A. V. C. action is not obtained. Adjust the oscillator standard wave trimmer until maximum output is obtained. This trimmer is on the tuning condenser and its location is shown in Fig. 2.

Then set the signal generator for 1500 K. C. Turn the rotor until maximum output is obtained. Loosen the set screw in the pointer hub and set the pointer at the 1500

K. C. mark on the standard wave band scale. Retighten the hub set screw. Then adjust the antenna and 1st detector standard wave trimmers until maximum output is obtained.

Next set the signal generator for 600 K. C. and adjust the 600 K. C. trimmer. The adjusting screw is reached through a hole in the front panel of the chassis as shown in Fig. 2. Turn the tuning condenser rotor until maximum output is obtained. Then turn the rotor slowly back and forth over this setting at the same time adjusting the 600 K. C. trimmer screw until the highest output is obtained.

Short Wave Band Adjustment CAUTION-After the standard wave band alignment

as described above has been made, do not change the adjustment of any of the standard wave band trimmers.

In aligning the short wave band of the receiver, it will be noted that the signal will be heard with the signal generator set at two points 912 K. C. apart. That is, if the receiver is tuned to 15,000 K. C. a signal will be heard when the signal generator is set at 15,000 K. C. and again at approximately 15,912 K. C. This is due to image reception or the fact that a 456 K. C. beat is obtained when the signal is 456 K. C. lower than the receiver oscillator and also when the signal is 456 K. C. higher than the receiver oscillator. Care should be taken to see that the receiver is tracked with the signal generator adjusted to the lower of the two frequencies at which a signal is heard, in order that the oscillator in the receiver will be 456 K. C. higher in frequency than the signal.

Turn the standard -short wave switch to the short wave position. Turn the rotor to the full open position. As ex- plained above, the volume control should be at the maximum position and the signal should be reduced to prevent A. V. C. action. Set the s'gnal generator for 18,300 K. C. Then adjust the oscillator short wave trimmer for maxi-

mum output. This trimmer is reached from under the chassis and its position is shown in Fig. 2. If a maximum

MODELS 62-3.34,62-13 4X

MONTGOMERY -WARD & CO. 62-139,62-139X Alignment, Data

output peak cannot be reacned, it may be due to Mt tact that the $.ntenna and 1st detector short wave trimmers are screwed down too far. Back off these two trimmer screws two or three turns and then adjust the oscillator short wave trimmer fur maximum output.

Next set the signal generator for 15,000 K. C. Turn the rotor until maximum output is obtained. Then adjust the antenna and 1st detector short wave trimmers for maximum output.

Next set the signal generator for 6000 K. C. and adjust the 6000 K. C. trimmer. This condenser is mounted on the front panel of the chassis as shown in Fig. 2 and is reached through a hole in the front panel. Turn the tuning condenser rotor until maximum output is obtained. Then turn the rotor slowly back and forth over this setting, at the same time adjusting the 6000 K. C. trimmer screw until the highest output is obtained.

Condenser Alignment Correct alignment is extremely important in connection

with all wave receivers. The receivers are all properly aligned at the factory with precision instruments and realignment should not be attempted unless all other possible causes of the faulty operation have first been investigated and unless the service technician has the proper equipment. A signal generator that will provide an accurately calibrated signal of 456 K. C. and accurately

calibrated signals over the broadcast and short wave bands, 530-1740 K. C. and 5.8-18.3 M. C., is required. An output indicating meter is also necessary. It will be practically impossible to align the receiver if unsatisfac- tory apparatus is used.

Use a non-metallic scr-ew driyer for the adjustments. The complete procedure is as follows:

Replacing Drive Cord Remove chassis from cabinet. Take off the pilot light assembly by lifting off the two

sockets and spring clips. Detach the large pointer by removing the screw at the

center of the dial. Loosen the dial assembly by taking out' the two screws

which secure the bottom of this assembly to the chassis. Then lay the complete dial assembly face downward

in front of the chassis. It is not necessary to remove the volume control and tone control collars which hold the indicator cords of these two controls in position.

Turn the drive drum until the opening in this drum is approximately vertical and with the hole at the top as shown in Fig. 3.

Remove the tension spring and the old drive cord. See that the eyelet is in the hole in the drive drum as

shown in Fig. 3. Insert one end of the drive cord from the outside through the hole in the eyelet in the drive drum.

Tie the end of the cord which has been inserted in the hole to one end of the tension spring.

Wrap the cord in a clockwise direction (facing front of chassis) around the drive drum approximately one-half turn.

Then tilt the chassis up on its back panel and brine the cord mentioned in the previous paragraph down to the drive shaft. Wrap it two and one-half times around the drive shaft as shown in Fig. 3.

Then bring this cord up from the drive shaft and wrap it around the drive drum approximately one and one fifth turns in a clockwise direction until it is up to the hole in this drum as illustrated.

Insert the free end of the cord through the hole in the eyelet and tie it to the end of the tension spring. The end of the spring, when hanging free, should be approximately %" from the flange of the drum as shown in Fig. 3. Cut off the surplus length of cord after it is knotted.

Then secure the other end of the tension spring over the spur on the drive drum.

Replace the dial assembly and pointer. Replace the pilot light assembly after which the chassis

may be reinstalled in the cabinet.



MODEL 52-16 Sehent:.tie ,tf oltage

Farts MONTGOMERY -WARD (Si CO.

as Z 2 7 n%wvN-{

efe iT

Ten Tube Super -Heterodyne This receiver is a super -heterodyne employing the following tubes:

Signal frequency amplifier, type No. 235; First detector, type No. 224;

Intermediate frequency amplifier, type No. 235; Second detector, typc

No. 227; First audio, type No. 227; Second audio, two type No. 247's;

Rectifier, type No. 280 and AVC tube, type No. 227.

A pre -selector is used between the antenna and the signal frequency RF stage being tuned by the two rear sections of the gang condenser.

One coil is mounted directly behind the condenser, in a shield, and the

other is located to the right of the condenser, next to the RF tube.

The oscillator and detector coils are magnetically coupled and are lo-

cated underneath the variable condenser. The L F. amplifier is designed to give as nearly as possible a flat top

response with a band width of ten kilocycles at a signal interference

ratio of 1,000 to I. The coils in the I. F. transformers, therefore are

adjusted to approximately critical coupling, and in aligning the I. F.

tuned circuits it is unnecessary to stagger the condensers to produce the desirable flat top tuning curve.

INSTALLATION The sensitivity of this receiver being extremely high, (2 to f micro-

volts) certain precautions are necessary in the installation which are un- important with receivers of poorer sensitivity. While no definite length can be established for the antenna due to varying local conditions, the average installation should be from 20 to 50 feet, including lead-in. In

some locations where field strength is very low, longer antennas may be

used, but in all cases, the antenna should be the shortest possible con- sistent with good station pickup.

Part No. PART NAME

47

The following voltages should be read with no signal being received: With 300,000 ohm voltmeter (200 volt scale, 1,000 ohms per volt) -

[rom ground to R. F. screen .......... _. _._._ .._. _...._. 95

From ground to R. F. plate _ ....._ .. _ . __ _..... _

_ 200

From ground to First detector cathode __ _.._ _. _ .._. .. ... .___ 10

From ground to Oscillator cathode - - f

From ground to Second detector cathode _ __.. _.... . 6

From ground to Second detector plate _ ... . ...... . ... .. _._ _. ... .__._. 10

from ground to Second detector plate resistance .. .. __ __... _. _.__ __....._.._ 71

From ground to First AF plate .. ....... ......._. __ _. _. _.... ._........ 75

From ground to Second AF screen 200

From ground to Second AF plate ... . . _.190 From ground to Speaker field -_-. __ .---.__ ._.. .__ 140

With 30,000 ohm meter (30 volt scale, 1,000 ohms per volt) - Second AF bias 13.5

Second RF bias __.._....._ _. ... 2.f First AF bias . .......... -.--- _-. _.----.---.- 4.8

With 600,000 ohm meter (600 volt scale, 1,000 ohms per volt)- 80 filament to C. T. of power transformer secondary _ _.__._ 341 V. A. V. C. grid voltage A. V. C. plate voltage -_ ...... ...........__.. ... 60

A. V. C. filter voltage AC VOLTAGE

Heater filaments .......... Pentode filaments ...... __ _-

80 filaments ._. __.._.___...

Replacement Parts List Model 62-16

Supplier: Davison -Haynes Mfg. Co., Los Angeles, California Unit Per Cost Selling Ch a sis Price Price Part No.

62-A I Power Transformer .._ ..... __ ..... 62-A 2 Audio Transformer ....... _. ...... 62-A 3 Intermediate Coil -Ist stage ........... ....__._____ 62-A 4 Intermediate Coil -2nd stage 62-A 5 Band Pass Coil 62-A 6 Antenna Coil ..._ _...._.-....- 62-A 7 Coil Shield Can _ ............. - 62-A 8 Tube Shield Can 62-A 9 Variable Condenser -4 gang 62-A10 Volume Control with Switch -1 meg ohm . ........ _.... 62-A 11 Tone Control 100,000 ohm .

62-Al2 Electrolytic Condenser 8 mfd. 62-A13 By Pass Block 281. mfd ..... ...... ... ......_. _.... _-.

62-A14 Dial Assembly with Escutcheon . . ..

RESISTORS

62 -Alf 62-A16 62-A17 62-A18 02-A19 62-A20 62-A21

150 ohm -2 watt .

10,000 ohm -2 watt 71,000 ohm -I wan 3,000 ohm -1 watt .

40,000 ohm -1/3 watt ... 10,000 ohm -1/3 watt 1,000 ohir.-1 /3 watt

32.00 f5.00 62-A22 .87 2.17 62-A23 .40 1.00 62-A24 .40 LOO 62-A25 .40 1.011 62-A26 .40 1.00 62-A27 .08 .20 62-A28 .08 .211

2.60 6.50 62-A29 .48 1.20 62-A30 .36 .90 62 -All .60 1.50 62-A32 .10 1.21 62-A33 .75 1.87 62-A34

02-A35 62-A36

1 2 51) 62-A37 .Il w 62-A38 .09 2 62-A39 .09 .22 62-A40 .08 20 62-A41 .08 '20 62-A42 .08 .20

PART NAME 50,000 ohm 1/3 watt 100,000 ohm 1/3 watt .... .. .-. 150,000 ohm -I/3 watt .._..._ _._ ..

250,000 ohm -1/3 watt .

2 meg ohm 1/3 watt 3 meg ohm 1/3 watt __.__.._ ._..... _ 60 ohm wirewound-

CONDENSERS .015-200 Volt ..__...__...__.__......._. .01-400 Volt _..

.05-400 Volt _......._. ..__.._ __. ___......__ _. .

.25-200 Volt .... ...._......_ _. __ .

.1-400 Vol[ _....... _. _.. ._ ._

R. F. Choke Tuning Meter A. C. Cord and l'lug Antenna and Ground Poet Phonograph Jack Magnavox Speaker No. 154

Knobs Tube Sockets:

4-227, 2-247, 1-280, 1-224, 2-231, 1

Unit Per Cha sis

. 1

peaker socket.

40

2.25 4.6

Coat Selling Price Price

.08 .20

.08 .20

.08 .20

.08 .20

.08 .20

.08 .20

.08 .20

.12 .30

.15 .37

.12 .30

.1) .37 12 .30 Ii 12

.2I .52

.75 1.88

.16 .40

.12 .10

.12 .30 2.75 6.88

.10 .25 .06 .15




P -loteo

IIOV

OSCILLATOR COIL P-IlO-.

Order all parts on stock order from Chicago or Oakland only.

Return defective parts for credit to Cnicago or Oakland only. Part No.

BE 100-9 BE 100-13 BE 100-14 BE 100-18 BE 101-11 BE 102-10 BE 103-3 BE 103-4 BE 104-4 BE 104-10 BE 104-11

BE 104-15

BE 105-5 BE 106-13 BE 107-5 BE 108-15 BE 108-16 BE 110-8 BE 111-11 BE 112-10 BE 112-21 BE 112-23 BE 112-24 BE 112-26 BE 112-31 BE 112-38 BE 112.40 BE 112-65

BE 112-68

BE 112-70

No. Used Selling Description in Set Price

.05 x 200 Volt Condenser -20% 1 .10

.05 x 400 Volt Condenser --20% 2 .10

.1 x 200 Volt Condenser -20% 1 .10 .01 x 400 Volt Condenser -5% 1 .10 Volume Control with Switch 1 .60 Two Gang Variable Condenser 1 1.30 18 Mfd. x 300 V. Electro. Cond 1 .70 16 Mfd. x 350 V. Electro. Cond 1 .'70 Power Transformer -50-60 Cycle 1 2.00 Power Transformer -25 Cycle 3.00 Power Transformer -Universal Pri- mary -40 Cycle Power Transformer -Universal Pri- mary -25 Cycle Antenna Choke Coil 1

14,275 Ohm Metal Clad Resistor 1

Line Cord and Plug 1

Output I.F. Transformer Complete 1

Input I.F. Transformer Complete 1

Oscillator Coil Complete in Can 1

Antenna Coil Complete in Can 1

Drive Bracket -Less Planetary 1

Dial 1

Pointer 1

Dial Glass 1

Planetary Drive Complete 1

Compression Spring 1

Bakelite Escutcheon 1

Pilot Light Bracket 2 Glass Retaining Escutcheon with glass Dial Scale used on sets with BE 112-65 escutcheons Dial Bracket -Less Planetary Re- places BE 112.10 on sets using Glass Retaining Escutcheon BE 112-65 1

3.50

4.60 .30 .40 .30 .80 .70

1.00 1.10 .30 .20 .06 .10 .50 .02 .30 .10

11 21

MODELS 62-135,62-150 MONTGOMERY -WARD & CO. 62-154

Schematic ,Vol tage ,Parts

5 Ovy/ G,vMCN

ANTENNA TAN

ANTENNA ONe COIL

P-105-0

1:19.1.V

DC DRITTO__ SW ROTATION

SHORTWAVE SWITCH P -12S -S

CONDENSERS No VALUE C I - 50 MICA C 2 490MICA C 3 - SM MICA C4- 05x2004 C D- .0554005 C 6 - 10o MICA C 7- 100 MICA C 8 - 05x 2005 C9.- OSx400V C 10'.- 0055400v C11.- 055 400v C 12 1 x 2 005 C ß i200v C 14.- 255200v C 1S' 2511200V C 16: IBM:D 550r P1O5-S C 17.- 14MFD 400V P-105-4 C 18 - 120,vV¡ f. 19 / C 20 -.0005MICA .

Z1,

Tuning Range 'Standard Wave

2GAN<1 CONDENSER Band

oST 2F

C12 CIS

IR R

ICS

INPUT I.P Co, 57OCC P- loe, U.

530 to 1720 Kilocycles

RESISTORALUS £ I. F. FREQUENCY 370 K.C.

NR V I~ R 1 - 50M SW R 2 - 50 VSw

R S - 500M VSw.

R 4 - 50M Ver R 5 500M VOLUMECONTROL P-10111

R 6 - SOON VO. R 7 - 250M VSW

A 8 25o1.4 Iw lt 1- 1000 R 10 575 R 11- 15M R 12 - ZDM VSW

R 15 - 250M Sw R - 750M ylE' R 15'--- 10M 1%5W

August 1, 1934

Short Wave Band 5.4 to 15.5 Meters) Megacycles

PHÓNO

Ce NOWWNR MF

1212 RIS 1134 2501.

- NOTE,- 1 1 CON DEMS£RD C.10. C M ,14 DUAL UNIT. C 14, C.IS 1deelhelf4

C.IS, C.4 - FIELD RESISTORS R 9. R.IO, R II IN ONE UNIT P -10A15 1260-. HoT

N214555.5 PREFIERO DV LETTER`P- ARE PART NUMBERS.

VOLTAGES TAKEN FROM POINTS INDICATED TO CHASSIS GROUND.VOLUMECONTROL OH FULL

RESISTORS. R.S,4, 66CONDENSERS C 67, ER ARE IM OUTPUT I. F. CAN. P-108.15

8Ö A

(19.5 to 55

SWITCH ON VOLUME CONTROL

TO MEATERS

LOT PI LTES 2 5 VOLTS

54245

4 POWER TRANS

P-IO44

A.C. LINE -CORD 119 VOLTS.

ì:OD 1I112.:3E tS FOLLOTZD BY

Repair Parts Price List No BE 114-1 BE 114-4 BE 116-1 BE 118-3

BE 118-4

BE 118-5

BE 124-5 BE 125-3 BE 129-2 BE 129-5 BE 129-9 BE 129-10

BE 129-11 BE 129-13 BE 130-1 BE 130-3 BE 130-11 BE 130-12 BE 130-17 BE 130-27 BE 130-28 BE 130-33 BE 131-2 BE 143-1

INDICATES 25 -CYCLES No. Used Selling

Description in Set Price Dynamic Speaker -Six Inch 3.80 Dynamic Speaker -Eight Inch 4.20 2.5 Volt Pilot Lamp-41-G3%Z 2 .10 .05 x .1-200 Volt Condenser - 20% 1 .20 .003 x .02-400 Volt Dual Cond 20% 1 .20 .25 x .25-200 Volt Dual Cond 20% 1 .20 J -3-S Series Padder 1 .16 Short Wave Switch 1 .70 .0005 Mica Condenser -20% 1 .10 .0001 Mica Condenser -20'% 2 .10 .005 Mica Condenser -10'h 1 .30 .00049 Mica Condenser - 12'ßi, Min. 8% 1 .10 .00005 Mica Condenser -30`,4 1 .10 120 Mmf. Mica Condenser -10'/r 1 .10 25M Ohm -1/3 Watt Carbon Res 1 .10 500M Ohm -1/3 Watt Carbon Res 2 .10 250M Ohm -1/3 Watt Carbon Res 2 .10 50M Ohm -1/3 Watt Carbon Res 2 .10 10M Ohm -1/3 Watt Carbon Res 1 .10 50M Ohm -1/3 Watt Carbon Res 1 .10 750M Ohm -1/3 Watt Carbon Res 1 .10 240M Ohm -1/3 Watt Carbon Res 1 .10 Bakelite Knobs (Inc. Springs) 3 .10 Tone Switch 1 .12 All Sockets .. .20 Cabinet -Model 62-135 5.60 Cabinet -Model 62-150 5.60 Cabinet -Model 62-154 13.00

All resistors are RIv1A color coded --specify value and/or resistor (per schematic diagram) and model number.

.40 When ordering condensers, specify part number, model num-

25 ber and/or capacitor (per schematic diagram) and model number.

When ordering parts, always specify part and model number .30 as well as serial number of chassis.

Z 1217 -TS+




MODELS 62-135,62-150,62-154 Socket,Trirurlers,nlignment MONTGOMERY -WARD & CO.

60 Cycle Chassis No. 62-135, No. 62-150 and 62-154

25 Cycle Chassis No. 62-135-X, No. 62-150-X and 62-154-X

Service Notes Voltages taken from different points of circuit to chassis are

measured, with volume control full on, right turn, with a volt meter haying a resistance of 1000 ohms per volt. These voltage are indicated on the schematic circuit diagram.

To check for ojien by-pass condensers, shunt each condenser with another condenser of similar capacity, which is known to be in good condition, until the defective unit is located.

Excessive hum, low volume, stuttering and a reduction in all D.C. voltages is usually caused by a shorted electrolytic condenser.

Open by-pass condensers frequently cause oscillation and distorted reproduction.

Should the planetary type vernier dial drive mechanism fail to function properly, it will probably be found to be due to a cracked, broken or weak compression spring. This drive may be dis -assembled by removing the two screws which fasten it to the dial bracket. The part number of the compression spring is BE112-31. All of the other dial parts are hardened and should cause no trouble.

Part BE 106-13, a metal clad resistor combining resistors R9, R10, R11, can. be repaired without removing by replacing open sections with carbon resistors.

R 9 = % watt 1000 ohms ± 10% R10 = 2 watt 275 ohms ± 10% R11 = 2 watts 13000 ohms ± 10%

Care should be used in replacing broken dial crystals, the small retaining ears sometimes break off unless they are carefully adjusted. Should they break, it is best to solder them in place rather than replace the entire BE112.10 unit.

Some .chassi% are equipped with glass retaining escutcheons Part No. BE 112.65, on these chassis dial scale No. BE 112.68 replaces BE 112.21.

25 Cycle Chassis The 25 cycle chassis, models 62-135X, 62-150X and 62.154X

may be used on a power supply from 105 to 115 volts, 60 cycles, but the 60 cycle models must not under any circumstances be operated on 25 cycles.

Chassis equipped with transformers for special voltages or fre ouencies are so marked.

CY

Aligning I. F. Transformers: 1. With volume control full on, at extreme right of its rota

tion, and with wave selector switch in the broadcast position, extreme left of its rotation, with variable condenser at its minimum capacity position, plates entirely out of mesh, adjust the I.F. transformers, parts nutfiber BE108.15 and BE108.16 in the following manner:

(a) Connect an external oscillator adjusted to 370 kilocycles in series with a .1 mfd. condenser to the control grid cap of the type 57 first detector tube.

(b) Adjust trimming condensers of both I.F. transformers to resonance. Use as a resonance indicator an output meter connected across the primary of the speaker input transformer or by means of an adapter between the plate and screen terminals of the type 2A5 output tube. Maximum deflection of the meter indicates resonance. Care should be taken to use only enough signal to give a readily readable output.

Note: The two trimmer condensers which tune the primary and secondary of the I.F. transformers are adju§ted by set screws and are accessible from the back of the chassis.

Broadcast Band Alignment: 1. Shift the frequency of the external oscillator to 535 kilo.

cycles and connect it in series with a 200 mmfd condenser to the tan antenna wire and the black ground wire.

(a) Set the variable condenser in its maximum capacity position, . plates entirely in mesh.

(b) Adjust the broadcastosctuator series trimmer to resonance with oscillator. This. adjustment is located between the variable condenser and the power transformer and is accessible from the top of the chassis.


a

Alignment The set should be carefully checked for all other possible

causes of trouble, such as defective tubes, condensers, resistors, poor installations and low line voltages before any attempt is

made at re -alignment.

Note': When making this adjustments slowly vary the frequency of the external oscillator as the adjustment is made. Ad- just for maximum output.

2., Shift frequency of external oscillator to 1712 kilocycles and set variable condenser in its minimum capacity position, plates entirely out of mesh:

(a) Adjust the broadcast oscillator shunt trimmer to resonance. This adjustment is the top adjustment in oscillator can assembly, part number BEI10.8 (see top view).

Short Wave Band Alignment: 1. Set the wave changing switch in the short wave position,

right turn, and shift external oscillator frequency to 15 mega cycles. Connect oscillator to tan antenna lead in series with a 300 ohm resistor to black ground wire.

(a) With selector knob adjust variable condenser so that dial indicator points to the 15 megacycle calibration on the bottom sector of the dial.

(b) Adjust the short wave oscillator shunt trimmer to resonance with the 15 megacycle signal (use care and make certain that you do not adjust to resonance with the image instead of the signal). This adjustment is the one closest to the chassis on the side of the oscillator coil can assembly, part number BE110.8, and is accessible from the side of the chassis.

(c) Adjust the short wave antenna trimmer to resonance. This adjustment is the single adjustment on the side of the antenna coil can assembly, part number BE111.11, and is accessible from the side of the chassis, between the type 57 and 27 tubes.

P n x



7;

?ViODZ, S 62-136,62-138 MONTGOMERY -WARD & CO. ehematic ,P arts

,----7 ---- / /sT.PET osc

6f7

I. .F/7SAYC

32

r /./LOT L/fNT

i

T! T/ --J AV vTR VN/T

The numbers on the 2 s',ckets shown at the right above, correspond with the numbers as shown, in the circuit.

/elf 6.06 Tt

z^'°1ET. / LT A!//0 687 /1 AS

/22-C7.- /2 Z3

Tr

14

7q. Y/fW OF J'AC JOC.tfT

TO/ /fN' OF Y.N. JOCKf7

6fY i

606 II

607

) /14J1,

I Lv/e. !/N/ --J LT P_5221 1st I. F. Coil and Can Assembly _.._.__..._.. .78

P-5203 2nd I. F. Coil and Can Assembly . .72

P-50626 Power Transformer - _ 1.69

P -50624A -6B Output Transformer p ..__ ..._... .43

P-50637 "B" Filter Reactor .42

P-1885 6D6 Tube Socket _....... _ ............. _ .06 P-1944 6B7 Tube Socket.. ____. __ _.... .06 P-1945 6F7 Tube Socket - .06

P-1946 12AS Tube Socket . __. 06

I'-2020 1223 Tube Socket 08

P -tí.17 Speaker Socket _

.06 P -2í1N1 Knob, Small _.. .10

P-2062 Knob, Large _.. _ _ .10 P-1)272 Rubber Chassis Cushions__.. .04

P-40445 Tube Shield _. .._ _. f1ß

l'-40443 Tube Shield Base ... .04

P-10320 Glass Crystal ._ _... .08

F-30875 Crystal Retainer Ring - . __ 06 P-1421 Single Lug Mtg.. 04 P-2130 Double insulated hltg. Lug .. 04 P20912 Large Double End Pointer -... P-30456 Small Pointer ......-

.10

.04 l'-30342 Grid Cap Only .04 P-70702 115 Volt Line and Plug Assembly. .32 P-70703 Antenna and Ground Wires .16

RECTT Ti /1Z3 e-7-1.

CONDENSERS

ó0bt R/4

Part No. Code Capacity Voltage Type Selling Price

P-80862 Cl .05 Mf. 2(10\' Tubular $ .08 P-80862 () .05 Mf. 2(í0V " .08 P-81801 C3 35 Mmf. Wire Capacitor Part of Ose. Assent. .08 P-80862. C4 .05 Mf. 200V Tubular .08 P-80888 C'S .25 Mf. 200V " .12 P-81049 rC6 .05 Mf. 200V " .20

`C7 .05 Mf. 200V " T-81811 C8 100 Mmf. Wire Capacitor _.. .08

l'-81051 C9 .002 Mf. 600V Tubular ._ _ 05 P -1ä18R C10 .25 Mf. 200\' .. .. .L' P-8087_ C11 .011íf. 6(10\" .._. __ .12 P-80888 C12 .251íL 200V .12 P-81062 C13 .01 Mf. 140V ... .12 P -ß105S C14 .05 Mf. 400\' ._ ..... ...._ .12 P-81052 C15 .015 Mf. 1600V _ .18 P-80887 C16 .10 Mf. 400V _. __ . .10 P-81016 C17 8.0 Mf. 300

LC18 8.0 Mf. 309V)Electrolytic Block 1.111

P-80993 C24 .5 Mf. 140V Tubular . .18 P-81806 C25 70 Mmf. Wire Capac. Part of 1st I. F. Assent.._ .. .II8 P-81804 C26 45 Mmf. Wire Capac. Part of 1st I. F. Assent .05 P-81808 C27 90 Mmf. Wire Capac. Part of 2nd 1. F. Assem. .08 P-81810 C28 100 Mmf. Wire Capac. Part of 2nd I. F. Assem. .08 P-81812 C29 200 Mmf. Wire Capac. Part of Ant. Assem. .08 P-81015 Three Gang Condenser .. -l.î0

C/g

o .5 C y to

G

- P-2012 Pilot Light Bulb (6.8 volts) 08 RESISTORS h E e `

Speaker 6" Mantel d P-2147 3.62 Part No. Code Resistance Wattage Type Selling . t°

P-2173 Speaker 8'^ Console 4.20 Price u - P-10347 Rubber Grommet (Small Gang Cond. Jttq.). .04 PÁ95104 R1 100,000 Ohm .2 Carbon 8.0? g. L. P-10296 Rubber Grommet (Large) _. _. 04 P -A95152 R2 1,500 Ohm .2 Carbon .. .. . .08 F.

P-1394303 R3 30,000 Ohm .S Carbon .08 a c P- A98205 R4 2 Megohm .2 Carbon .08 o ii P- 98021 RS 400 Ohm .2 Wire Wound .08 o

"B" POWER UNIT PARTS P-093702 R6 7,000 Ohm 1.0 Carbon 10 c P- 96014 R7 500,0(10 Ohm Volume Control .. _ .50 . d U C P -B94204 R8 200,000 Ohm .5 Carbon .. . .G8 e

P-70770 Shield Cable and Plug .24 P -B94603 R9 6(1,000 Ohm 5 Carbon 08 " P-40439 Vibrator Shield Can .12 P -A95203 810 20,00D Ohm .2 Carbon _ .08 ÿ v P-2153 Vibrator í'1ít ....._ 2.98 P-Á95504 811 500,000 Ohm .2 Carbon 10 p~ ß p P-5172 R. F. Choke Coils.._ .14 P -A94104 R12 100,000 Ohm .2 Carbon .... _. .08 -

P-2021 Vibrator Socket .06 P- 97011 R13 150,000 Ohm Tone ('antral - .3t P-10349 Rubber Band (For Mtg. Vili.) .12 P- 98035 814 450 Ohm 2.0 Wire Wound . .08

P-20926 Screw Hook (For Mtg. Vib.) 04 l'- 98034 R15 25 Ohm 3.0 Wire Wound . .08

P-81101 C19 .01 Mf. 400V Tubular Condenser ¡l8 P-1ì95602 RI6 6,000 Ohm 5 Carbon 08

P-81101 020 .01 Mf. 400V Tubular Condenser _ .. .08 INTERFERENCE ELIMINATION PARTS P-80888 C21 .25 Mf. 200V Tubular Condenser. .. .1_' Part No. Selling Price P-80888 C22 .25 Mf. 200V Tubular Condenser .... .12 P-80933 Dual .5 11íd. Generator Condenser .. .60 l'-81034 C2.3 .5 Mf. 140V Tubular Condenser._ . .16 62-5424 Spark Plug Suppressor . .. 25

eJohn F. Rider, Publisher


PAGE 6-12 MO\T.-WARD




11O\ T. -WARD PAGE 6-13

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MODELS 62-147,62-156,

31U TGOMERY-WÂR1) & CO. 62-164.Series A Schematic,Voltage

sEklss A Alignment,Trinºners

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CONDENSERS Nº VALUE C.1:- 2870.." MICA CE,- 100 - C.3:- 416 CG4: .1 X LOOV C6: 15 7.00V. C.6:- .1 X 7.00V

.117.00V C.19- .11000V C.9:- .I X LOON,.

500y.7/M1CA C.r1:- SOOWyJMICA C.IL:- 0552005 C.13- 015400V

4.0MFD X LSV C 15:-.0155400V C.16: 3.OMFO.X250V CI?- 4011001300V

LEGEND RESISTORS

N. VALUE R.1'- SOO.. Sw. R.L:- 50M. - R.3:- 7004- R.4'- 100MA R S:- LOI4 . Iéw. R.6- 19M 6 VAw.

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R 9:- IMEG RIO:- ESOM4 R.II:- 0140G. ` Fut.- 5001ÁA. VOL. CONTROL R.13:- 500M.- VSW.

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:NOTE C. T, C.9 ARE IM ONE UNIT P.II8'I C 14. C.I4, C.IT, ONE UNIT LYTIC P -119 -II R 7, R.14, R.15, ONE UNIT P-104-18

NUMDERS PREFIXED Dr LETTER P ARE PART NUMDERS.

VOLTAGES TAKEN FROM POINTS INDICATED TO CHASSIS GROUND. VOLUME CONTROL ON FULL

165

CIS

IF PEAK 370 KC.

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WAVE CHANGE SWITCH P-125-4' 3 POSITIONS #

ROTATING CLKWISE- IL POSITION -NC 1720- 540KC 2NP - - MW. 74 LSMC 3A -Sw 030- 7.SMC

SWITCH SHOWN AT SW POSITION

Series "A" chassis are equipped with dry electrolytic filter con-

densers and are serially numbered on paper tags which are attached to the line cord and to the inside of the cabinet.

X .AFTER r:10D3. NIIPI3ER INDICATES 25 -CYCLE OP ERA.TION

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TUNING RANGE -SERIES A:

Standard Broadcast Band 540 - 1720 Kilocycles Intermediate Band 2.3 - 7.6 Megacycles Short Wave Band 7.5 - 23.0 Megacycles

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MODELS 62-147,62-156 62-164, Series, A

Alignment .3ION TGOI7ERY-WARD & CO.

Aligning I. F. Transformers 1. With volume control full on, the extreme right of its rotation,

and with wave changing switch in the broadcast position, extreme left of its rotation, and with variable condenser at. its minimum capacity position, plates, entirely out of mesh, adjust the I.F. transformers (adjustments at the top of parts number 108-26 and 108-27-see top view).

(a) Connect external oscillator in series with I.F. dummy antenna. With external oscillator adjusted to 370 kilocycles, in series with I.F. dummy antenna to the control grid cap of the type 6D6 tube and chassis ground, adjust output I.F. transformer, part number 108-27, to resonance.

Note: Output I.F. transformer, part number 108-27, has only one adjustment.

(b) Move generator output clip from grid of 6D6 to grid cap of type 6F7 tube and align input I.F. transformer, part number 108-26, to resonance. NOTE: IT IS EXTREMELY NECES- SARY TO ALIGN BOTH I.F. STAGES SEPARATELY.

Broadcast Band Alignment- (540 - 1720 Kilocycles)

1. With wave changing switch in the broadcast position, extreme left of its rotation, and with gang condenser in its minimum capacity position, plates entirely out of mesh, and with external oscillator connected in series with broadcast dummy antenna to tan antenna lead and black ground lead, make the following adjustments:

(a) Set external oscillator to 1720 kilocycles and adjust oscillator trimmer to resonance. This adjustment is the rear adjustment of a group of three located next to the variable condenser.

(bI Readjust external oscillator to 600 kilocycles and adjust broadcast series pad to resonance by rotating condenser to approximately 600 kilocycles, rocking it slowly to and fro until by adjusting pad maximum output is attained. This adjustment is located at the front of the chassis next to the variable condenser and wave changing switch.

(cl Check for tracking and sensitivity at 1400 and 1000 kilocycles. NOTE: It is extremely necessary in making all of the above adjustments that the fundamental signal of the oscillator be tuned in and not the image frequency, which will fall below the fundamental.

Short Wave Band Alignment- (7.5 - 23.0 Megacycles)

I. This hand is aligned after the I.F. adjustments have been com- pleted. Set wave selector switch in the short wave position, extreme right of its rotation, set pointer of dial to 21 megacycles.

(a) With external oscillator set at 21 megacycles, and connected to the tan antenna lead in series with the short wave dummy and to the black ground lead, adjust the oscillator short wave trimmer until generator signal is picked up. This trimmer is the one closest to the front of the chassis of the group of three trimmers located next to the gang condenser (see top view of chassis).

(b) Adjust short wave antenna trimmer to resonance. This adjustment is to the right of the 6F7 tube and is the one closest to the front of the chassis (see top view).

(c) Re -set external oscillator to 9 megacycles and pick up oscillator signal by rotating variable condenser, moving dial pointer. Check for tracking and sensitivity and do not bend plates. Nom: It is extremely necessary in making all of the above adjustments that the fundamental signal of the oscillator be tuned in and not the image frequency, which will fall below the fundamental.

Intermediate Band Alignment- (2.3 - 7.6 Megacycles)

1. With wave selector switch in the center position and with dial pointer set to 7 megacycles, makes the following adjustments:

(a) With external oscillator set at 7 magacycles and connected in series with the short wave dummy antenna to the tan antenna lead and black ground lead, same as for short wave adjustments, adjust center trimmer of oscillator coil, part number 110-13, until 7 magacycle signal is picked up. This is the center adjustment of a group of three located next to the gang condenser (see top view).

(b) Adjust antenna trimmer to resonance, this adjustment is the rear of a group of two located at the right of the chassis next to the 6F7 tube (see top view).

(c) Re -set external oscillator to 2.5 magacycles (2500 kilocycles), pick up signal by rotating condenser and moving dial pointer. Check for tracking and sensitivity. Do not bend plates. NOTE: It is extremely necessary in making all of the above adjustments that the fundamental signal of the oscillator he tuned in and not the image frequency, which will fall below the fundamental.

Service Notes To check for open by-pass condensers, shunt each condenser with

another of similar capacity and of the same voltage rating, which is known to be good, until the defective unit is located. Open by-pass condensers frequently cause oscillation and distorted tone. Defec- tive and shorted electrolytic filter condensers cause excessive hum, motor -boating, low volume and a reduction in all D.C. voltages. Open or shorted electrolytic and by-pass condensers (across bias resistor of type 42 tube) will cause low volume and distorted tone.

Should the planetary vernier dial drive mechanism fail to function properly, it will probably be found to be due to a cracked or broken compression spring. The drive may be disassembled to replace the compression spring (part number 112-31) by removing the two screws which fasten it to the dial bracket. Before reassem- bling all parts should be carefully cleaned and a small amount of vaseline applied to the ball hearings. All other dial parts ,are hardened and should cause no trouble.

Notes-(Series "A" Only) -

25 Cycle chassis differ from regular 60 cycle and 40 cycle chassis in that a larger electrolytic filter condenser is used. The regular condenser is part number 119-11 and the larger unit for the 25 cycle chassis is part number 119-12.

Part number 106-18, a metal clad resistor, consists of the following sections with resistances and wattages as noted: one, 500 ohms; one, 35 ohms, one, 200 ohms, all 1/3 watt, plus or minus 10%.

X AFTER MODEL NUMBER INDICATES 25-CYCLE OPERATION

SERIES A Alignment

No aligning adjustments should be attempted without first thor- oughly checking over all other possible causes of trouble, such as poor installations, open or grounded antenna systems, low line voltages, defective tubes, condensers and resistors. In order to properly align this chassis, an oscillator (generator) is absolutely necessary. No aligning adjustments should be attempted with the chassis in the cabinet. To remove the knobs, pull them off and to take the chassis out of the cabinet, remove the three bolts by which it is fastened and the speaker plug which you will find on the front flange of the chassis.

(cJohn F. Rider, Publisher



77A TA,i'NA

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CONDENSERS N. VALUE GI SE! NOTE C. -- iti.OV C 5- IOO...,/ MICA C.4 1%LOOV C Ste NOTE C4 1lLOOV CT - .1%200V Ce - .11200V C 9-- .111200?. C.e0-100,,f MICA C.11- IOO.y/MICA C.IL-83E2001

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RESISTORS N. VALUE

e0M TEW RL' 700 R.3-10014

ESN TAW. R.9:-LOM RI, -250 KW RT--SOM - R.' ZOOM - R.9'-00oM YOLcONTL Rkr-INEG. Yiw' 5.11'-L50N .

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G4.C.e IN DUAL UNIT PIIe-I C.7 C.9 - C.I&C.IT NUMBERS PREFIXED Sy LETTER 'P.

ARE PART NUMBERS.

VOLTAGES TAKEN FROM POINTS INDICATED TO CHASSIS GROUND VOLUME CONTROL ON FULL

WAVE SWITCH P -12E-4. 3POSITION5 ROTATING CL'ISWISE -.- IW POSITION. DC. 1720-530KC 25 -MW 77-2. SS NC 3RP - SW. 9.0 - 70 NC

5WITC,1 SHOWN AT Sw POSITION

Series "B" and "C' chassis are serially numbered on the back flange of the chassis, series "B" beginning with number "5A100510B" and up; series "C" chassis, beginning with number "5B105635C", differs only from series "B" in that the I.F. frequency was changed from 370 to 465 kilocycles.

Transformers are available and chassis are sometimes equipped with universal transformers for operation on 40 and 60 cycles and with primary taps for 108, 125, 150, 220 and 250 volts (see illus- trations) and also sometimes equipped with 25 cycle transformer with 1h5-115 volt or 220 volt primaries, not universals.

Series "B" and "C" may be identified by the letter "B" and "C" at he end of the serial numbers.

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TUNING RANGE-SERIES B & C:

Standard Broadcast Band 530 - 1720 Kilocycles Intermediate Band 2.35 - 7.7 Megacycles Short Wave Band 7.6 - 19.0 Megacycles

75

1011.1MinT 1 `nom J

ROOT CHANGE en. /HG

YODELS 62-147,62-156, 62-184. Serios B & C.

Schematic,Voltage

SER/AL HUMOERS Socket Tri>±mers SER/ES G3A/GO/B-'/P `SERE3 B ER/f3 C

3ER/t6 C --10/03433C //P en.f -- - p30..7 P/Od-9 - WAVE IRAM- P-/rJ3-/0 R/// -/G - AHICO/L - PV// -27 P//0-/4 - 03C CO/L- A//011 ...v.:2024- INPUT /, i -P -/00-3G P-/OI.e. - OVIIV/T/!- P-/08-40

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IF PEAK 465 KC.

POWER TRANS. R1.4-4 SO'GO CYCLE. P 104 -IT -UNIVERSAL. P.104 -IS' 'RECYCLE.

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MODELS 62-147,62-155, 62-164. Series B & C.

Alignment, Notes MONTGOMERY -WARD & CO.

ALIGNING INSTRUCTIONS-SERIES IIBII & 11011

NOTE: These instructions are written for series "C". The instructions are identical for series "B", except that for series "B" the I.F. frequency is 370 kilocycles and for series "C", 465 kilocycles. Also, the I.F. transformers are different:

Series "B" Part No. 108-26-Input 1. F. Trans. Part No. 108.28-Output I. F. Trans.

Series "C" Part No. 108-38-Input I. F. Trans. Part No. 108-40-Output I. F. Trans.

Description of various dummy antennas used and referred to in these instructions:

(1) I.F. Dummy-Consists of a .1 mfd. condenser connected in series with the external oscillator.

(2) Broadcast Dummy-Consists of a 200 mmfd. condenser and a 20 ohm resistor connected in series with each other and in series with the external oscillator.

(3) Intermediate and Short Wave Dummy-Consists of a .1 mfd. condenser and a 400 ohm resistor connected in series with each other and in series with the external oscillator.

Resonance Indicator: Use as _ a.:ce indicator an output meter connected across

the primary of the speaker inpi.t .ransformer, or by means of an adapter between the plate and screen terminals of the type 42 output tube. Maximum deflection of the meter indicates resonance. Use only enough signal to get a readily readable output. A low range output meter or the low scale of a multi -range volt meter should he used.

SERIES B & C Alignment

No aligning adjustments should be attempted without first thor- oughly checking over all other possible causes of trouble, such as poor installations, open or grounded antenna systems, low line voltages, defective tubes, condensers and resistors. In order to properly align this chassis, an oscillator (generator) is absolutely necessary. No aligning adjustments should be attempted with the chassis in the cabinet. To remove the knobs, pull them off and to take the chassis out of the cabinet, remove the three bolts by which it is fastened and the speaker plug which you will find on the front flange of the chassis panel.

Aligning I. F. Transformers 1. With volume control full on, the extreme right of its rotation,

and with wave changing switch in the broadcast position, extreme left of its rotation, and with variable condenser at its minimum capacity position, plates entirely out of mesh, adjust the I.F. transformers (two adjustments at the top of parts number 108-38 and 108-40- -see top view). (a) Connect external oscillator which has been adjusted to 465

kilocycles in series with I.F. dummy antenna, to the control grid cap of the type 6D6 tube and chassis ground. Adjust output I.F. transformer, part number 108-40, to resonance.

(b) Move generator output clip from grid of 6D6 to grid cap of 6F7 tube and align input I.F. transformer, part number 108-38.

(c) With generator connected to grid of type 6F7 tube, readjust output I.F. transformer, part number 108-40, to resonance.

Broadcast Band Alignment- (530 - 1720 Kilocycles)

I. With wave changing switch in the broadcast position, extreme left of its rotation, and with gang condenser in its minimum capacity position, plates entirely out of mesh, connect an external oscillator in series with broadcast dummy antenna to tan. antenna and black ground leads and make the following adjustments:

(a) With external oscillator set at 1720 kilocycles, adjust oscillator trimmer to resonance, for location of this adjustment, number 6, see diagram.

(b) Re -set external oscillator to 1400 kilocycles, rotate condenser, pick up oscillator signal and adjust antenna trimmer to resonance. For location of this adjustment, number 3, see diagram.

(c) Re -set external oscillator to 600 kilocycles and adjust series pad to resonance, rotate condenser and move dial pointer to 600 kilocycles by gently rocking condenser to and fro. Pick up oscillator signal while adjusting series pad to resonance, maximum deflection on an output meter. This adjustment is accessible from the top of the chassis and is located between variable condenser and power transformer, see top view-part number 124-16.

(d) Check for tracking and sensitivity at 1000 kilocycles.

NOTE (Series "B" and "C" Only)

25 Cycle Chassis differ only from 60 cycle chassis in that part number 104-18 transformer is used in place of 50/60 cycle transformer, part number 10414.

Short Wave Band Alignment- (7.6 - 19.0 Megacycles)

1. This band is aligned after the I.F. adjustments have been con- pleted. Set wave changing switch to short wave position, extreme right of its rotation, set dial pointer to 18 megacycles.

(a) With external oscillator adjusted to 18 megacycles and connected in series with short wave dummy antenna to tan antenna and black ground leads, adjust the oscillator short wave trimmer until generator signal is picked up. For location of this adjustment, number 4, see diagram.

(b) Adjust short wave antenna trimmer to resonance. For location of this adjustment, number 1, see diagram.

(c) Re -set external oscillator to 9 megacycles, rotate condenser, move dial pointer to 9 megacycles and check for tracking and sensitivity. Do not bend plates. NOTE: It is extremely necessary in making all of the above adjustments that the fundamental signal of the oscillator be tuned in and not the image frequency, which will fall below the fundamental.

Intermediate Band Alignment= (2.35 - 7.7 Megacycles)

1. With wave changing switch in center position, and with dial pointer set to 7 megacycles, make the following adjustments: (a) With external oscillator set at 7 megacycles and connected

in series with short wave dummy antenna, as for shortwave adjustments, adjust trimmer of oscillator coil, part number 110.22 until 7 megacycle signal is picked up. For location of this adjustment, number 5, see diagram.

(b) Adjust antenna trimmer to resonance, adjustment number 2, see diagram.

(c) Re -set external oscillator to 2.5 megacycles (2500 kilocycles), rotate variable condenser, move pointer, pick up oscillator signal and check for tracking and sensitivity. NOTE: It is extremely necessary in making all of the above adjustments that the fundamental signal of the oscillator be tuned in and not the image frequency, which will fall below the fundamental.

Service Notes To check for open by-pass condensers, shunt each condenser with

another of similar capacity sod of the same voltage rating, which is known to be good, until the defective unit is located. Open by-pass condensers frequently cause oscillation and distorted tone. Defec- tive and shorted electrolytic filter condensers cause excessive hum, motor -boating, low volume and a reduction in all D.C. voltages. Open or shorted electrolytic and by-pass condensers (across bias resistor of type 42 tube) will cause low volume and distorted tone.

Should the planetary vernier dial drive mechanism fail to function properly, it will probably he found to be due to a cracked or broken compression spring. The drive may be disassembled to replace the compression spring (part number 112-311 by removing the two screws which fasten it to the dial bracket. Before re -assembling all parts should be carefully cleaned and a small amount of vaseline applied to the hall bearings. All other dial parts are hardened and should cause no trouble.




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MODELS 62-147,62-147X,

MONTGOMERY -WARD & CO. 62-156,62-156X,62-164, 62-164X. Sbries A,B & C

Parts List

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MODEL 62PC43 Schematic Voltage,Parts

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VOLTAGES


se

With the volume control at maximum and no signal being received, the following values of voltage should be observed at the.points indicated:

Ground to R. F. Plate, 240 Ground to First Detector Plate, 240 Ground to Second Detector Plate, 60 Ground to A. F. Plate, 220

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Ground to Screens, 1 l 5.

Across Field, 95

Across 350w Bias Resistor, 20 Across Second Detector Bias, 111

Across First Detector Bias, IO Across 1. F. Bias, 3'A. Filament, 2.25 A. C. Rectifier, 4.8 A. C.

Replacement Parts List Airline Model 62 -PC -43

Supplier: Davison Radio and Television Corporation, Los Angeles, California

Part No. PART NAME Unit Pcr Coat Ch ' Price

Selling Price Put No. PART NAME

Unit Per Coat Churl, Price

Selling Price

SW- 431 Tube Socket No. 56 1 f .06 $ .15 SW -4317 R. F. Coil I .25 .63 SW- 432 Tube Socket No. 57 1 .06 .15 SW -4318 Oscillator Coil 1 .25 .63 SW- 433 Tube Socket No. 58. 1 .06 .15 SW -4319 Electrolytic Condenser, Dual, 4 Mfd. 1 .60 1.50 SW- 434 Tube Socket No. 47 1 .06 .15 SW -4320 Wave Switch 1 .75 1.88 SW- 435 SW- 436

Tube Socket No. 80 Variable Condenser, 2 Gang

1 .06 1 1.00

.15 SW -4321 2.50 SW -4322

Cub Condenser, .1-200 Volt Cub Condenser, .1-400 Volt__

3

1

.12

.18 .30 .45

SW- 437 Dial 1 .75 1.88 SW -4323 Cub Condenser, .01 2 .12 .30 SW- 438 Power Transformer 1 1.25 3.13 SW -4324 Cub Condenser, .001-10% I .12 .30 SW- 439 Volume Control 1 .48 1.20 SW -4325 Cub Condenser, .001-3%...__ I .18 .45 SW -4310 Speaker - 1 1.75 4.38 SW -4326 Cub Condenser, .00035-3%__.. I .18 .45 SW -4311 SW -4312

Coil Shields Tube Shields

3 .06 2 .06

.15 SW -4327

.15 SW -4328 Resistor Strip -350 W. W. _ Resistor Strip -Two 10,000 Ohms

1

1

.10 .25

.25 .63

SW -4313 I. F. Transformer 2 .40 1.00 SW -4329 Resistor -2 Meg. 1/3 Watt 2 .06 .15 SW -4314 SW -4315 SW -4316

Varitor Ant. and Ground Post Pilot Light

2 .20 1 .10 I .06

.50 SW -4330

.25 SW -4331

.15 SW -4332

Resistor -5,000 Ohm 1/3 Watt Resistor -50,000 Ohm 1/3 Watt Resistor -1 Megohm 1/3 Watt

1

1

1

.06 .06 .06

.15

.15

.15



MISSION -BELL PAGE 6-1

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PAGE 6-20 MONT. -WARD MODEL 62--166 Alignment,Voltage Socket,Trirnners

Resistance Test

I. F. Adjustment Remove chassis from case. Establish ground connection between chassis and power

supply. Reconnect A and B wires from power supply to chassis. Set the signai generator tor a signal of 17b KC. Connect the antenna lead of the signal generator thru

a .05 mf. condenser to the stator of the 1st detector (mid- dle) section of the tuning condenser. This can be done by pushing a wire or conductor between the stator plates or by extending an insulated wire thru the hole in the shield over the stator and pushing the wire thru the hole in the lug which extends up from the insulated stator assembly.

Connect the ground lead of the signal generator to the chassis ground.

Short out the oscillator section of the tuning condenser. Set the volume control at the maximum position. Attenuate the signal from the signal generator to prevent

the levelling off action of the A.V.C. Then adjust the three I.F. trimmers until maximum output

is obtained. The location of these trimmers are shown in Fig. 2.

1650 KC. Adjustment Set the signal generator for 1650 KC. Turn the rotor of the tuning condenser to the full open

position. Connect the shielded antenna lead from the chassis through

a 250 nunf. condenser to the antenna post of the signal generator.

For this and all subsequent adjustments keep the volume control at the maximum position and attenuate the signal from the signal generator to prevent A. V. C. action.

Adjust the trimmer of the oscillator section of the three gang condenser until maximum output is obtained -see Fig. 2 tor location of this trimmer.

1400 K C. Adjustment Set the signal generator for 1400 KC. Turn the rotor of the tuning condenser carefully until.

maximum output is obtained. Adjust the 1st detector and antenna trimmers for maxi-

num output. Do not change the setting of the oscillator trimmer.

Adjusting Antenna Trimmer Atter the receiver is installed and the car antenna is con-

nected it will be necessary to adjust the antenna trimmer. Tune in a weak signal between 1200 and 1400 KC. with the volume control about three -fourths on. Remove the cover of the chassis case. The antenna trimmer is the trimmer condenser closest to the terminal strip -see rib Turn the adjusting screw of this condenser up or down until maximum output is obtained. CAUTION -Do not turn any of the other trimmer adjusting screws for this adjustment.

Calibrating the Receiver After installing the receiver in the car, it will be necessary

to calibrate the control unit. Tune in a station of known f re ,uency c! abo tt the center of the dial. At the back of the control unit is a calibration screw -See Fig. 4 in the installation manual enclosed with each receiver. Remove the pilot light assembly.

The calibration screw will be seen at the bottom of the receptacle from which the pilot light assembly is withdrawn. Insert a screwdriver and turn this screw until the pointer on the dial scale is at the frequency of the station being received. The knob must be held during this adjustment.


Changes In Early Models In the early models, resistor R14, and condenser 00,

were not used. In these models resistor R11 was rated at 200,000 ohms.

The capacity range of the 1st I.F. Trimmer Condensers. C9 and CIO, was from 130 to 300 mmf. in the early models.

'o tages et oc ets Antenna Disconnected - Voltage at Battery 6.1

Type of

Tube Function Across

Heater Plate

to G round

Screen to

Ground

Cath. to

Ground

Normal Plate M.A.

6D6 R. F. 5.8 218 100 5.2 5.8

6C6 1st Det. and Osc. 5.8 218 100 2.0

6D6 I. F. 5.8 218 100 52 5.8

75 2nd Det. & 1st A. F.

5.8 160 (1) 1.4 2.8

41 Output 5.8 210 220 16.0 16.0

84 Rectifier 5.8 20.0 per plate

Speaker Field ..1.15 Amperes "B' Unit ......3.10 Amperes Chassis ....... 1.5a Amperes Pilot Lam. ....0.1 Amperes

(1) Measured on 1000 V. Scale (1000 Ohms per volt)

D. C. Resistance of Windings

Following are the D. C. resistances of the various

Part No.

P -9A368

windings in the chassis. ITEM

Antenna Trans. Primaries Code

D. C. Re- sistance in Ohms

in Series TI 6.3 Antenna Trans. Secondary Tf 2.5

P' -9A369 R.F. Interstage Trans. Pri. T2 4.5 R.F. Interstage Trans. Sec. T2

(Center Tap to inside) 1.8 (Center Tap to ground) 1.3

P - 9A371 1st I.F Trans. Primary T3 58. Ist I.F. Trans. Secondary 'l'3 58.

P -9A370 Oscillator Cathode Coil (Total) T4 3. Oscillator Plate Coil '1'4 6.

I' -9A372 2nd IF. Trans. Primary T5 46. 2nd I.F. Trans. Secondary T5 46.

P- 51X 17 Output Trans. Primary T6 440. Output Trans. Sec. and Voice

coil in parallel T6 4

P -53X72 Power Trans. Primary 'I7 .3 Power Trans. Secondary T7 500.

P -52X27 Filter Choke 1.1 300. P - 9A374 Filament Reactor 1.2 Small l' - 9A24it R.F. "B" Choke 1,3 3.5 P -9A375 Pilot Light Choke Assembly 1.4 Small P-12A62A Speaker Field I S 5. P. 9A373 Motor Noise Choke If, Small

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Fig. 2 -Tube Arrangement and Trimmers

@John F. Rider. Publisher



Part No.

i)uan. Used

P -18.A31 1

P 18A34 1

P -18A32 1

P-i8A36 1

P -18A37 1

P -18A38 1

P -13X52 1

P -13X204 I

P -13X211 1

P -7A32 1

P -20X59 4

P -20X74 4

P -19X18 8

P -20X75 8

P -20X77 8

P -28X33 1

P -20X76 1

P20X78 1

P -16X14 1

P -16X3 1

P -21M 1

P -48X27 1

P -20X74 1

P- 21A5 1

P-21A7

P-Z5A33 1

P-25 A34 1


INSTALLATION ITEMS

Description

Replacement Parts List

25" Volume Control Flexible Drive Shaft .58 (Standard Equipment)

25" Tuning Condenser Flexible Drive Shaft (Standard Equipment) .62

20" Volume Control Flexible Drive Shaft .54

20" Tuning Condenser Flexible Drive Shaft .54

32" Volume Control Flexible Drive Shaft .74 32" Tuning Condenser Flexible Drive Shaft .78 Ammeter Cable and Fuse Receptacle

.16 Antenna Cable and Fitting Pilot Light Cable Assembly .38 Pilot Light Bulb -Bayonet Pin Base

(6-8 V) .10 Double End Hexagon Bolts for Mounting

(H Chassis to dash 5/16" Shakeproof Lockwashers for above

Mounting Assembly doz. .04

Flat Washers for above mounting assembly doz. .08

5/16" Split Lockwashers for above mounting assembly doz. .04

5/16"-18 Hexagon Nuts for above assembly, doz. .08

Ground Spring (to ground Tuning Con- denser Flexible Shaft) .04

No. 6 Shakeproof Lockwasher to assemble Groúnd Spring doz. .04

6-32x5 ' Round Head Machine Srrew to mount Ground Spring doz. .04

20 Ampere Fuse .04 Fuse Shield A4

Distributor Suppressor .16 Generator Condenser .30 Additional 5/16" Shakeproof Lockwasher

to Ground Chassis Case to Metal Dash Surface on Engine Side doz. .84

Choke Condenser Unit (not shipped with set) 72

Spark Plug Suppressors (not shipped with set) 0

Set of Steering Column Mounting Brackets complete with necessary mounting screws, nuts and lockwashers .40

Under'Instrument Panel Mounting Bracket complete with necessary mounting screws, nuts and lockwashers .30

MISCELLANEOUS Part Selling No. Description Price

1' 3A114 6C6 Tube Socket t .06

l' -3A113 6D6 Tube Socket .06

P 3A116 41 Tube Socket .116

P -3A99 75 Tube Socket .05

P. 11X8 Rubber Bands (for above tubes) 2.04

P-12.4(,2 6" Speaker .14 74

l' -13X53 "A" Cable 1' 3Á108 Small Pin _Tack (For Pilot I.ight Connection) .06

P -3A136 large Pin Jack (For Antenna Connection) .06

1'-4A46 2 Lug Terminal Strip (Ground Lug Extended) .04

P -4A45 "A" & "ß+" Power Terminal Strip .01

P 4A38 1 T.ug Terminal Strip (Insulated -Left Hand .01 Mounting)

I' 30X14 Grid Cap Only .04

l'-IOA20 Tone Control Knob .06

P -30X1 \Vire Clamp doz .06

l' -29X16 Flexible Shaft Anchor Bushing .12

P -20X27 Anchor Bushing Clamping Nut 06

P -20X28 Hexagon Nut for above assembly P -20X80 Shakeproof Lockwasher (for above assembly)doe. 04

P -19X13 Flat Washers (for above assembly) doz. .04

P -20X61 8-32 Wing Nuts for securing cover to casedoz. .OR

l' -20X79 No. 8 Split Lockwashers (for above nuts) doz. .01

"B" UNIT PARTS Pert Selling No. Description Code Price

P -9A2611 R.F. "B" Choke Coil Assembly 1,3 .M,

P -9A374 Filament Reactor 1.2 .24

l' 53X72 Power Transformer T7 1.52

P -52X27 Filter Choke 1.1 .4%

P 19A14 Vibrator --Mallory 2 62

P -19A16 Vibrator--Radiart 2.62

P -)A127 Vibrator Socket .116

í'-3A128 84 Tube Socket .06

P -4A42 2 Doug Terminal Strip (Both 'Insulated) 316

I' 4A17 1 Lug Terminal Strip (Insulated - 04 Right Hand Mounting)

I' 45X204 Dry Electrolytic (See Condensers) C27 I ((1)

I' 46X89 1 65 mf. 180 Volt Tubular Condenser ..C24 .36

P 46X83 .01 mf. IR00 Volt Tubala+ C mdenyers C25 .14

P -46X9.3 .50 mf. 180 Volt Tubular Condensers C?.% .18

Part Na

P -51X17 P -9A368 P -9A369

P -1A23

MODEL 62-166 Parts Licit

TRANSFORMERS AND COILS Selling

Description Code Price

Output Transformer T6 .78

Antenna Coil Assembly (Less Can) T1 .44

R.F. Interstage Coil Assembly T2 .60 (Less Can)

Dual -Coil Can Assembly Only (for .16 above two coils)

P -9A371 1st I.F. Coil & Can Assembly T3 .82 Complete

P -9A370 Oscillator Coil & Can Assembly T4 .30 Complete

Coil 2nd I.F. Coil & Can Assembly T5 98 Complete

P -9A375 Pilot Light Choke Assembly L4 .08

P -9A373 Motor Noise Choke 1.6 1.3 .054 P -9A268 R.F. "B" Choke Coil Assentbly

3 .24 P -9A374 Filament Reactor L

L2 1.24 P -53X72 Power Transformer TT1

.52 P -52X27 Filter Choke

Part No. P -47X54

P -46X80 P -47X50 P -47X53 P -46X81 P -46X83

'P -17A32

tP-17A33

P -46X82 P -17A18

P -45X203

P -47X52 P -46X84 P -47X52 P -46X92 P -46X116 P -46X85 P -46X93 P -46X119 P -46X88

P -45X204

I' -46X93 P -47X30 P -46X94 P -14A39

Part No.

P -A95504 P-139415.3 P -B94203

P 43X41

P. A95503 P -A95105 P- A94504 P-95752 P -36X200

P -40X201 .P A952(34 tP-A95154 P -A95504 tP-A95503

CONDENSERS Code Capacity Voltage Type

Selling

CI .0005 mf. Moulded - .O8

C2 Antenna Trimmer -Part of Gang Condenser C3 .05 mf. 180 Tubular .08

C4 .003 info Moulded .12

CS .000035 mf.Moulded .06

C6 .10 mf. 400 Tubular .12

C7 .10 mi. 180 Tubular .12

C8 1st Detector Trimmer -Part of Gang Condenser IC9 130-300 mmf. (1st I. F, Trimmer Con.

.21 I CIO 130-300 mmt. J densers J C9 70-150 mmf. 11st I. F. Trimmer Con

.18 ( CIO 70-150 mmi. I densers

C11 Oscillator Trimmer -Part of Gang Condenser C12 10 mf. 180 Tubular 1?

C13 70140 mmf. 2nd I.F. Trimmer Condenser .1(1

('14 00025 mf. Part of 2nd 1.F. Coil Assembly I C15 12.00 mi. 25 1 Dry Electro- ( C21 12.00 mf. 25 J lvtie Block .50

C16 .00025 mf. Moulded .08

Cí7 .01 mf. 180 Tubular .O8

C113.1111025 inf.Moulded .08

Cl9 .006 mf. 600 Tubular .10

C20 .01 mf. 400 Tubular .10

('22 .002 mf. 600 Tubular .10 C23 .50 mf. 180 Tubular

C24 1.65 mf. 180 Tubular .38 ('25 .01 nil. I80Ú Tubular .14

I ('26 6.00 info 3501 Dry Electro- ( CV 8.00 info 350 J lytic Block 1.00

(C29 .Oi,3 tmf.

.18 180 Moulded .12

C30 .25 info 300 Tubular .14 3 Section Gang Condenser 2.00

RESISTORS Selling Code

RI R2 R3

Resistance 500,000 Ohm

15,000 Ohm 20,000 Ohm

Wattage Type 0.2 Carbon 3.5 Carbon 0.5 Carbon

Price .0, .08 .08

I R4 I R13

450 Ohm 800 Ohm

0.2 i Armored Wire 0.5 J Wound .14

RS R6

50.000 Ohm 1.0 Megohm

9.2 Carbon 0.2 Carbon .............

.0606

R7 50(000 Ohm 0.2 Carbon .06

RR 7,500 Ohm 0.2 Carbon (16

A9 2.0 Megobrn 'opime Control & Switch .56

RIO 309.0fÁ Ohm Tone Control .14

RII 200.000 Ohm 0.2 Carbon .06

R I 1 15(1,000 Ohm 0.2 Carbon ....... . .. .06

R)2 51)0.000 Ohm 0.2 Carbon . .06

R14 50,000 Ohm 0.2 Carbon

CONTROL UNIT PARTS Qum). Part (I

Selling Description Used v '"n Price

p.20A17 I Complete Remote Control Less Flexible Shafts and Pilot Light Cable Assemfily.$2.09

P .35X37 1 Control Unit ('ase (front) With Screws P -35X38 1 ('ontrol Unit Case (harki With Screws .42

P 3X41 I Dial Scale Assembly with Pointer and Celluloid Gear (Specify for part F -20A17) .41'

P 35X39 1

Station for

Sha aft (,xnplete with (fear and Hors .20

P -74X211 1 intermediate Gear .0', P -16X214 1 Volume Control Shaft .0,

P -28X45 1 Volume Control Tension Spring with Nut and T.ock washer .12

P -17X9 I Celluloid Crystal ne .08

P11)A52 2 Knob with Set Screw .

Used in early models. (See article on changes in this manual.)

t Used in later models. (See article an changes in this manual.)

@John F. Rider, Publisher www.americanradiohistory.com

PAGE 6-22 MONT. -WARD MOD 2L 62PC55 Schelaatic,Voltage

.il i gnr.lent

1

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1I 00/'

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i


.01

5G

t,

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IF PEAK 465 .;C.

SERVICE NOTES ON MODEL 62 -PC -55

6 -TUBE AIRLINE RECEIVER

The No. 55 is a combination long and short wave receiver, with a

frequency range from 3400 K.C. to 550 K.C., and the change from

the short wave to broadcast band is accomplished by a 2 -section change-

over switch.

The oscillator uses a separate 56 tube. The first detector is also con-

nected to the A.V.C. section of the No. SS tube, so that better A.V.C.

action may be had. The I.F. amplifier is resonated at 46S K.C. The

No. SS tubé is used as second detector, and functions as an automatic

volume control and triode audio stage also. The 247 power pentode is

connected to the output of the 55 through a resistance or capacity cir-

cuit. The high voltage rectifier is an 80 tube.

CIRCUIT ADJUSTMENTS

In aligning this receiver, a 465 K.C. modulated oscillator and out-

put meter are required, and the following procedure is recommended:

Use output meter connected in parallel with the plate circuit of the

power pentode. Connect the oscillator with the grid of the first de-

tector. Adjust each of the trimming condensers on the I.F. trans-

formers located underneath the chassis, until maximum signal is shown

on the output meter. Go over these trimmers several times, as the

over-all performance of this receiver depends on I.F. transformer ad-

justment. If a signal other than 465 K.C. is used, for aligning the

amplifier, the oscillator and pre -selector circuit will fail to track.

Images will also appear at the low frequency end of the broadcast band.

Next, set the dial at 100 degrees when the variable condenser plates are

fully meshed. Then set the oscillator to give a 1400 K.C. signal. When

the dial is turned to 1400 K.C., a signal should be heard. Adjust the

s5

f,vikA

looM .05

47

80

ti

ti ti 6--,

r

IS..n F.V mml%

8.

trimming condenser on the variable condenser section nearest the front of the chassis, until the maximum signal is indicated by output meter. Now, adjust the trimmers on the other two sections for maximum signal. The same procedure should be followed with the oscillator set at 900, 700 and 600 K.C.

CAUTION

Do not attempt to bend oscillator plates. All balancing should be

done with volume control wide open, and to test oscillator, adjust it to low signal level.

If the intermediate transformers and 2 -gang condenser are properly aligned for broadcast, no adjustment is necessary for the cracking of the high frequency bands.

VOLTAGES OF 6 -TUBE SET

Ground to Audio Plate Ground to Audio Screen Ground to 2nd Detector Plate Ground to I.F. and 1st Detector Plates Ground to I.F. and 1st Detector Screens Ground to Oscillator Plate Drop through Speaker Fields

Measured with 300,000 ,Ohm Meter.

Ground to 1st Detector Cathode Ground to Oscillator Cathode

Measured with 30,000 Ohm Meter.

A. C. All Filaments 2.35

80 Filaments 4.75

Input Filaments 11 I.

215 Volts 240 Volts 70 Volts

240 Volts 80 Volts 80 Volts

105 Volts

2 Volts 21 Volts

Volts Volts Volts



MONT. -WARD PAGE -6-23

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MODELS 62-173,62-175, 62-176,62-1 77, 62-188 62-193

Color Coding, MONTGOMERY -WARD & CO. Resistance Data

Voltage Trimmers Socket

OSC. COIL

ANTENNA TRANJFOQ/fE.2 WHITE

WV/ E WA/TE

C3z

Ç_C/y n

REDWN/TE

ILACK IHN/TE

210E TO 114V/TEER To T/Y. JT ZR/I

LACK yAN` CgND TR9NDFD)J

YELLOW TO 1 , /'LATÈ OF OJC.

AC TO TRACK/Her CO/L

REEK M7Y/rE C23 TO CATAbDE OE OJC.

NOTE REJ/STANCE Y4L UEJ #07 JNOWN Ara. JHAL L.

/NTERSTi9GE P .F T,P9A/JFOR/`fER

.ì11 LrL uE TO

YELLOW TO PLATE OH RF

.4/1 SLACK

(f ref NAM

END NEAREJT CRASS/

.SWITCH CONTACT CO CAT/ON AHD

JTAND4, 13 N(47SERAMF

WN/rE

WN/TE TO GANO CON

RED

REEN

POWER T.rNNJFOR/'lE1e

Fig. 3-Color Coding of Coil Wires and D. C. Resistance of Wind,ngs 600 A C rRAYMCR(e24ri. 2LsOO AR TRAYMrR (Eta,

0.1C .S712 W4rrX _ rRNYNER

M-rARLT/MOELJ-=

ArT JPO WM« TAMYrLER (ar)

RNT JT/ WM? 714~7' wM/E 1,03,3E0 (CL) TR/MMFR (C3)

Ox. JrO WORE rR/HPIrR kiJ) `Av LRTER MMELJ

/NT SNORT WRIT PRIMMER (CE)

..., ,..,.,,a O

OJC. JAtlRr AYpA'E re/nMER(C20)

O O

BOTTOM OF Cl/ASS/.3

Fig. 4 -.Location of Trimmers 6B7 2 GCP OEr.

PHONO ACA' -

Fig. 7-Phonograph Connections

VOLTAGES AT SOCKETS Line Voltage - 112

Antenna Shorted to Ground

Type of

Tube Function Heater

olts Plate

to Ground

Screen to

Ground

Cathode to

Ground

3

Plate M. A.

7. 6D6 R. F. 6.1 240 95

6D6 1st Det. 6.1 240 100 9 3.5

76 Osc. 6.1 100 5.

6D6 I. F. '6.1 240 120 3 7.5

6B7 2nd Det. 6.1 55 ,., 0 2.3

42 Power 6.1 225 240 17 (I) 38.0

32.0 per plate

80 Rectifier 4.6

(1) As read across RI3.

ANTENNA wN/rr 222 5F TONHAI rJ /irzE TIw1YRJ GEM, azNCK

Fig. I-Arrangement of Controls Fig. 6 --Location of Tubes

()John F. Rider. Publisher



General Service Data D. C. Resistance of Windings

Following are the D. C. resistances of the various windings in the chassis. The values given below will vary

slightly in different sets. Refer to Fig. 3.

New Part No. Item 9.\ 368 Antenna Transformer

Range B Primary Winding TI Range D Primary Winding T1 Range B Secondary Winding TI Range I) Secondary Winding T1

9A387 R. F. Interstage Transformer Range B Primary Winding T2 Range D Primary Winding T2 Range B Secondary Winding T2 Range D Secondary Winding T2

9A388 Oscillator Coils Range B Grid Coil

Red White to White Red White to ground

Range D Grid Coil T5 Black White to Black Black White to ground

Oscillator Plate Ccil 9%389 1st I. P. Transformer

Primary Winding Secondary Winding

9A390 2nd I. P. Transformer Primary Winding Secondary Winding

D. C. Re- sistance

Code in Ohms

T5

T5

T3 T3

T4 T4

Output Transformer (Part of Speaker Assembly) Primary Winding T7 Secondary Winding T7'

Dynamic Speaker Speaker Field Speaker Voice Coil Speaker Bucking Coil

53X91 115 volt 60 cycle -Power Transformer Primary Winding -. T6 Tube Filament Secondary (A -A) .... T6 80 Filament Secondary T6 High Voltage Secondary Winding TO

Center tap to inside Center tap to outside

9A391 High Frequency Oscillator Tracking Coil 1.1

Replacement Parts New Old Part Part No. No. Description

124222 6" Dynamic Speaker Comp. with 4.15 Output Trans. Ti

12A223 8" Dynamic Speaker Comp. with 4.90 Output Trans. T7

124221 10" Dynamic Speaker Comp. with 645

Output Trans. Ti 2A41 Two Section Band Change Switch 1.65

15 25X221 Chassis Mounting Feet

.10 30X14 30342 Grid . Clip 4438 2106 Two Lug Terminal Strip (1 Lug

Insulated) .10

4A17 1421 Single Lug Terminal Strip .10

4A49 Single Lug Terminal Strip (Mtg. .10 hole used)

4450 Two Lug Terminal Strip (Both Lugs .10 Insulated Mtg. Foot in Center)

94386 T1 Antenna Trans. and Can Assembly $2.35

94387 T2 R.F. Interstage Trans. and Can 1 75 Assembly

94389 T3 1st I.F. Coil and Can Assembly .

9A390 T4 2nd T.F. Coil and Can Assembly . 2.30

9A388 T5 Oscillator Coil and Can Assembly. 1,70

53X91 T6 Power Transformer 115 Volt; 3 60 cycles

53X92 T6 Power Transformer. 115 Volt; 5.95

25 cycles 53X99 T6 Power

Transformer 230 Volt;

les 4.10

9A391 LI High Frequency Oscillator Track- ing Coil Assembly

147X59 Cl 290 mmfd.

7A36 C2 2-25 mmfd. Antennal uStandard 5 1

Wave Trimmer .10

17436 C3 2-25 mmfd. Antenna Short Wave Trimmer .10

46X19) C4 .050 mfd. 180 Tubular .13

46X103 CS .050 mfd. 240 Tubular .15

46X105 C6 .100 mfd. 360 Tubular .2J

17A36 C7 2-25 mmfd. R.F. Interstage Standard Wave Trimmer .10

17A36 Cl 2-25 mmfd. RF ortt e

Interstage .10

MOD L S 62-173,62-175 62-176,62-177,62-188 62-193 Resistance Test,Parts

C9 .250 mfd. C10 .050 mfd.

J C11 70-150 mmfd. 1

1 C13

7015250 mm

J C14 70.150 mmfd. C15 150.250 mmtd.J C16 50 mmfd. C17 .250 mfd.

20.7 C18 .250 mfd. 360 Tubular 0.3 Cl9 2.25 mmfd. Oscillator Standard 6.1 Wave Trimmer

Small 17A36 C20 2-25 mmfd. Oscillator Short Wave Trimmer

3 0 46X105 C21 .100 360 Tubular 0.4 Oscillator 600 KC

6.0 J C22 300-610 mmfd. 1 Padding Trimmer .45

Small 17Á35 t C23 40-100 mmfd. J Oscillator (4100 KC Padding Trimmer

.10 47X53 C24 3S mmfd. Moulded

4.0 44X10 C25 14.00 mid. 400 Wet Electrolytic 1.25

Small 44X11 C26 18.00 mfd. 300 Wet Electrolytic 1.10

46X108 C27 .050 mfd. 600 Tubular Small 46X100 C28 .002 mfd. 600 Tubular .... .15

Small 46X110 C29 .030 mfd. 180 Tubular .15

0.2 46X109 C30 .010 mid. 480 Tubular .15

46X100 C31 .002 mfd. 600 Tubular .... .15

12 0 49X63 C32 10 mmfd. Moulded .... .10

11.1 14A42 3 Section Gang Condenser 3.85

C94233 RI 25.00(1 ohms 1.0 Carbott $ .15

]2 0 B93303 R2 30.000 ohms .5 Carbon .20

4.5 B94602 R3 6.000 ohms .5 Carbon .15

*94252 R4 2.500 ohms .2 Carbon .15

51 D93163 RS 16,000 ohms 2.0 Carbon _45

1.0 A94151 R6 150 ohms .2 Carbon .15

A95205 R7 2.0 Megohms .2 Carbon .10

1025.4 B94304 R8 300.000 ohms .5 Carbon .15 0.

36X205 R9 500,000 ohms Volarne Control tk 0.2 Switch 1.05

A94203 RIO 20.000 ohms .2 Carbon .15

7.5 B94603 R11 60000 ohms .5 Carbon .15

0.2 A94803 R12 80.000 ohms .2 Parson .15

0 2 43X42 R13 235 ohms 2.0 AWou d .25

13. A94104 R14 100.000 ohms .2 Carbon .15

178. A95504 RI5 500.000 ohms .2 Carbon .10

40X204 R16 150.000 ohms' Tone Control .75

1.1 2431 Phono Switch (Double Pole Double Throw Switch)

.10$ 6 3412 Phono Jack.20 10A36 Switch Knob 45X37 12.0 Mf. - 25 Volt - Dry Electrolytic

75 Condenser .75

A94901 900 Ohm - 0.2 Watt 12 Inches of No. 722G Shielded Hookup

10 Wire

2.35

240 Tubular 25 180 Tubular .15

1st I.F. Trimmers .40

180 Tubular 2nd I.F. Trimmers

Moulded 360 Tubular .30

List Price

46X104 46X80

l7Á33 46X102

I7Á34

47X56 46X107 46X116 f7Á36

J.emscyrocer POR "rave JW/TC

Wire

Dial and Drive Assembly (Specify name and Model No.)

and Dial Strip Only (Specify name Model No.)

s,eiowa

Fig. 5 -Antenna Transformer

on Early Models

AWOCA' O(/T FOR PMOWO 9CA'

BACA' of CHASS/S Fig. 8 -Location of Phono Knockouts

.30

.40

.10

.35

.10

.10

.20

.55


PAGE 6-26 MONT. -WARD MODELS 62-173,62-175 62-176,62-177,62-188 62-193 Alignment, Data


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PAGE 6-28 MONT -WARD

MODELS 62-178,62-181 62-189,62-211

Alignment, Data MONTGOMERY -WARD & CO.

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The 68 receiver uses the following tubes: - 1 No. 56 Oscillator. 1 No. 58 R. F. 1 No. 57 First Detector. I No. 58 Intermediate. 1 No. 55 Second Detector. 1 No. 46 First Audio. 2 No. 46 Push Pull in Second Audio. 1 No. 82 Rectifier.

The oscillatory and intermediate circuits of this receiver are of the conventional type. The Second Detector, incorporating No. SS tube, will be found very interesting as it performs as a diode detector and automatic control and one stage of audio, which is equivalent to three tubes in the usual receiver. The audio channel uses the 46 to drive a

pair of 46's in Class B. It will be found in voltage checks that the plate is near 400 volts, while the current drain will be in the order of 7 M.A., with no signal on the grids of the 46's in push pull, but when sufficient power is furnished by the driver, the power output may reach 15 watts with an instantaneous current drain of 200 M.A.

The noise control, or noise suppressor, is a 10,000 ohm variable resistor in the cathode circuit of the I.F. and R.F. tubes, working much the same as the volume control in the older types of sets.

CIRCUIT ALIGNMENT The intermediate frequency is tuned at 175 K.C. and 2 I.F. trans-

formers are used. The usual care must be used in adjusting these if good results are to be had. All adjustments of this receiver should be made with the volume control at maximum. The following procedure is recommended:-

Use output meter connected in parallel with the plate circuit of the power pentode. Connect the oscillator with the grid of the first detector. Adjust each of the trimming condensers on the I.F. transformers located underneath the chassis, until maximum signal is shown on the output meter. Go over these trimmers several times, as the overall performance of this receiver depends on I.F. transformer adjustment. If a signal other than 175 K.C. is used for aligning the amplifier, the oscillator and pre -selector circuit will fail to track. Images will also appear at the low frequency end of the broadcast band. Next, set the dial at 100 degrees when the variable condenser plates are fully meshed. Then set the oscillator to give a 1400 K.C. signal. When the dial is turned to 1400 K.C., a signal should be heard. Adjust the trimming condenser on the variable condenser section nearest the front of the chassis, until the maximum signal is indicated by output meter. Now, adjust the trimmers on the other two sections for maximum signal. The same procedure should be followed with the oscillator set at 900, 700 and 600 K.C.

CAUTION Do not attempt to bend oscillator plates. All balancing should be

done with volume control wide open, and to test oscillator, adjust it to low signal level.

VOLTAGES OF 9 -TUBE SET Ground to 2nd Audio Plates 340 Volts Ground to High side of speaker Fields 340 Volts

Measured with Meter 1000 ohms per volt. Ground to Other side of speaker Fields 260 Volts Drop Across Fields 80 Volts Ground to 2nd Detector Plate 35 Volts Ground to I.F. and 1st Detector Plates 260 Volts Ground to Oscillator Plate 90 Volts Ground to I.F. and 1st Detector Screens 90 Volts Ground to 46 Driver 260 Volts

Measured with Meter 1000 ohms per volt. Drop through Filter Choke 17 Volts Ground to I.F. Cathodes 3-5 Volts

Measured with Meter 1000 ohms per volt. A. C.

246 Audio Filament 2.15 Volts Heater Filament 2.10 Volts

82 Filament 2.20 Volts Input 106. Volts



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PAGE 6-38 MONT -WARD N1ODII, 62PC64 Schematic.Voltage Parts List

T

3!N dett


54 ta

1C 00..t...0., ...,.,..y.

,...... 5660

5 Mid

VOLTAGE READINGS The following voltages should be observed at the points indicated: -

NOTE: In making these readings, a high resistance volt meter should be used, having resistance of at least 1000 ohms per volt.

Across each field, 75 volts. Across entire voltage divider, 215. Across first 40 ohm section, 4. Across second 40 ohm section, 4. Across 350 ohm section, 3. Across first 5000 ohm section, 42. Across second 5000 ohm section, 42. Across 6700 ohm section, 120.

Part No. PC- 641 PC- 642 PC- 643 PC- 644 PC- 645 PC- 646 PC- 647 PC- 648 PC- 649 PC -6410 PC -6411 PC -6412 PC -6413 PC -6414 PC -6415 PC -6416 PC -6417 PC -6418 PC -6419 PC -6420 PC -6421

I I

56 a.. 0.,.

PEAK 175 KC

T t51N

20 6.0.,2.616

M151-

Across 46 bias resistance, 17 %Z.

Across filter choke, 1. Across second audio bias resistor, 10. Across 50,000 ohm A.V.C. filter resistor, 45. Across 25,000 ohm A.V.C. Grid resistor, 25. Across 100,000 ohm A.V.C. plate resistor, 80. From ground to second AF plate, 200. From ground to first AF plate, 150. From ground to RF and I.F. plates, 200. From ground to RF screens, 85. From ground to oscillator cathode, 5. From ground to first detector cathode, 5.

Replacement Parts List 12 Tube Super -Heterodyne Model 62 -PC -64

Supplier: Davison Radio and Television Corporation, Los Angeles, California DESCRIPTION

Power Transformer Dual 8 Elec. Condenser Dual 8-4 Elec. Condenser Filter Choke No. 370__ Toggle Switch Volume Control 1 meg ohm Tone Control 100,000 ohm -

Noise Control 100,000 ohm Variable Condenser 4 Gang Intermediate Base No. 140

- Dial Assembly Escutcheon Plate Noise Control Escutcheon Audio Transformer No. 0984 Antenna Coil Band Pass Coil Translator Coil Litz Intermediate Coils Resistor -1000 ohm 1/3 W Resistor -3000 ohm 1/3 W Resistor -40,000 ohm 1/3 W

Unit Per Unit Chassis Price

Selling Price Part No.

I .$1.75 $4.38 PC -6422 1 .75 1.88 PC -6423 1 1.00 2.50 PC -6424 I .21 .52 PC -6425 I .25 .63 PC -6426 I .48 1.20 PC -6427

1 .36 .90 PC -6428 1 .36 .90 PC -6429 I 2.00 5.00 PC -6430 2 .30 .75 PC -643 I

1 2.00 5.00 PC -6432 1 .75 1.88 PC -6433 1 .25 .63 PC -6434 1 .87 2.18 PC -6435 1 .40 1.00 PC -6436 1 .40 1.00 PC -6437 1 .60 1.50 PC -6438 2 .40 1.00 PC -6439 2 .06 .15 PC -6440 1 .06 .15 PC -6441

.06 .15 PC -6442

DESCRIP l'ION Resistor -50,000 ohm 1/3 W

Unir Per Chassis

I

Unit Price

$ .06

Selling Price

.Ii: Resistor -V4 meg ohm 1/3 W. 1 .06 .15 Resistor -%z meg ohm 1/3 W._._ 1 .06 .15 Resistor -1 meg ohm 1/3 W. 4 .06 .15 Resistor -2 meg ohm 1/3 W 2 .06 .15 Resistor -400,000 ohm 1/3 W. .06 .15 Resistor -25,000 ohm 1/3 W. -Solo .10 .25 Resistor -50,000 ohm 1/3 W.-5% .10 .25 Resistor -100,000 ohm 1/3 W.-5%._ .10 .25 Resistor -350 Candohm Strip .08 .20 Resistor -6 Section Candohm Strip .36 .90 Condenser .0001-10% 2 .08 .20 Condenser .00025-10% 1 .08 .20 Condenser .001-3% 1 .15 .37 Condenser .015 5 .10 .75

1 .08 .20 Condenser .05-200 V. 1 .08 .20 Condenser .05-400 V. 2 .08 .20 Condenser .1-200 V. 5 .08 .20' Condenser .25-400 V. 1 .10 .25 Condenser 10 Mfd.-25 V. 1 .25 .63





VOLTAGES AT SOCKETS Input 6.3 Volts-Antenna Disconnected at Connector Type

°f Tube Function Volts

at Heater

Plate to

Cathode

Screen to

Cathode

Grid to

Cathode

Normal Plate M.A.

6D6 R F. 6.2 154 95 3.0 5.2

6C6 1st Det. Ose. 6.2 160 97

95

0 3.0

6D6 I. F. 6.2 154 3.0 5.2

75 2nd Det. & 1st A. F. 6.2 110 - 1. .25

41 Power 6.2 143 146 14. 13.0

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MODEL 62-199 Schematic,Voltage Socket,Trianers Parte List

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PAGE 6-40 MONT. -WARD MODEL 62-199 Alignment Cervice Notes

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C t 2sn m:nF C 2 2-25 mmf. Ç 3 225 mmf. C 4 2-25 mml. C 5 .05 mf. 180 V. C.6 .25 mf. 180 V. C 7 2-25 mmf. C 8 2-25 nunf. C 9 2-25 mmf. CIO 35 mmf..

t.

;ki0D,S 62-203,62-205

MONTGOMERY -WARD & CO. 62-208,62-212,62-217 (R Range 535 to 1730 KC. 62--219

Tuning Frequency Range (`C Range 1680 to 4800 KC. Scher;atic,Triiìriere D Range 5650 to 16000 KC.

C11 .05 mf. (80 V. 822 70 150 mmf. 1 ()NE ('33 20.n mf. 150 V. Electrolytic R 8 3.0 Megnhnt .2 \V. ('12 .25 mf. 180 V. CZ) 70.150 m,ef. J ASSEMBLY C34 .05 mf. 240 V. ti ', I n \I, relie 2 \V. CI3 35 mmf. C24 40-100 mmi. Rlo 7.11(111 011111 2 05'. C14 2.2.5 mmf. C25 50 mmf. R I I 7.11110 Ohm .2 VV. C15 1400 mmf. C26 100 mmf. 12 1 1,000 Ohm .2 W. 1212 3.11 5Iegnhm .2 VV. (1(1 2-25 mmf. C27 50 mmf. R 2 1.0 Alegnhm .2 \V. R13 .300110 Osn, .2 \\'. (17 300-600 mmf. I ONE C20 .002 mf. 600 V. I2 3 100.000 Ohm .2 \V. R14 150,000 Ohm Tune C18 40-100 mmf. J ASSEMBLY C29 .05 mf. 180 V. 12 4 5.021 Ohm .2 W. Control CIS 2.25 mmf. ('35 250 mmf. 1) 5 In non Ohm .5 \V. C20 :0A50 mmf. I ONE (-31 .50 mf. 180 V. 12 6 60.010 Ohm .2 \V. C21 70-150 mmf. J ASSE3II3I.V C32 .20 mf. 180 V. R 7 I_0 Mt'getIlo Vol. Cent.

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PAGE 6-42 MONT. -WARD MODELS 62-203,62-205 62-208,62-212,62-217 62-219

JNOR.r WOVE

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4S +22f

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45

B -.BLACK

B +90 Ç.eEEN

B +/3J BLUE

Fig. 3-Complete Battery Wiring Connections

EYELET (INSERTEDÌ FROM TO

DRIVE CORD

DRIVE SHAFT

Fig. 12-Drive Cord Replacement

FOR/1 /OQ/-

3. YOLT

\ME

TF.e

Voltage, Socket ,Data

Fig. 6- -Schematic Diagram of Voltage R.gulator

C -9 B.BOWN

C +BLACK

C -4i YfLLOIY 6.FEEN

Fig. 4-"C" Battery Connections Using Standard "C" Batteries

JN/PP/NÇ Jet. T.NHP71rR er90L7 (C9)

PWR.

JHAIL 709E JN/EL D

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J/11/LL TIME J///ELD

LARGE TYKE N/ LD .

12£°IF r /± 1"f '

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Fig. 10 Tube Arrangement

(cad m C2/)

VOLTAGES AT SOCKETS Batteries up to Rated Voltages Ant. Shorted to Ground

Voltages Read from Negative Fil. Terminal Volume Control at Maximum

Type of

Tube Function Across

Filam't Plate

to Ground

Screen to

Ground

Control Grid to Ground

Norn .d Plate

M. A.

34 R. F. Amp. 2.0 135 45 1.8

106 1st Detector Oscillator 2.0

135 75íu 65 2.6

1.8(1)

34 1st I. F. Amp. 2.0 135 45 1.8 34 ?nd I. F. Amp. 2.0 133 75 4.5 2.25

3.0

30 ?nd Detector 2.0 30 A. F. Amp. 2.0 135

19 Power Amp. 2.0 135 4.5 1.0 Per Plate)

(1) Anode Grid




MONTGOMERY -WARD & CO. MODELS 62-203,62-205

62-208,62-212,62-217 62-219 Alignment,Drive Cord Changes, Data

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l'AGE 6-44 MONT. -WARD

MODELS 62-203,62-205

62-208,62-212,62-217 62-219 Resistance Test,Parts Color Cod ing,Data

S ÚÚÚv6.lit¡cezz VVVVUVzn Eic VÚVVVnnßtigani

2{6ÑrS9 0. .. .- .

t$J E^FhFgÉÉ=2Ú

sÿa _ 6Z N

;i =R`R'RR4 ó za.záááááe`.sááé

(aJohn F. Rider, Publisher


ARVIN PAGE 6-1

R3

15

NOBLITT SPARKS INDUSTRIES ..OD 1iJ 7 Sche:^latic, Voltage Resistance s,?arts

ARVIN CAR RADIO MODEL 7 6F7 6A7 687

Tt

»La Cis

CO

R 4

Rs

- T3i

13 Css I

1 o

I

_J

T4 r 1 I

a j 1

la L_ L_ - -' R4

R

~Ri5 C 275

10

27

R 20

C 15 C 75 C Ì3A C5 C131/ R 10

R`.OA4

cya

' vRt3 s

14H

IR!

6

T sPK

Rc STO_R3 [re,_ -"-`Y-t NSRII4}¡NÿW T M fPNC ¡." ,t4 4

rt 70 . NN :G P-t.44 t0OLe10N Al. Moo l0 904 _ C00M''A.17-1001 .Y, YI IM,7.t0G/ 4

1 . HaDl.r 1741111 ; oa 5

xCM LO.17.tO1C' .r0

.4 T YII".41TM00 10 '10sM0A".t004' .t0

Tabe 6F7 6A7 6B7 41 f4i

.Mt M1U NO 17N43 NIX 'V4344790 00 7.OMI MICA 005 17-10441

0,MMMICA 00117-7111 atLLl!AA11RaI1,,17-3ll .3O 0.111 MICA G10 174501 á01Mll' : 0 10 OC 174701

$ wY 11 MIMI 771M1 DMA 11

RSOan 70 CANT aOI It 9t1a1tNtr7 19A1) TwIN 10.17.4711

178 .I

R MAY eC YARICo 140 PROM e0,000 A 140 TO 90,000 fl TO 1f' 13 401;17'4714, CONTDOC S1N11TNITY. 10

Reaten 6 6

7000

Si .S 1t+

C4

e1

ea IMmica ' 440Í f70.4.11 1DU,Ll 00 tree e.rff

..II MA O DYAI- 9C0,17.4.II.e1l 17A 1/ Tw1N 116444-473n 93¡11/1tI.eCT. 71 1f) : u 1

T7

= .

l i Ct31

tA

CONDE N3ER3 CAPACITT ITIMIT af C LCAPIiCITYYOLT

a 9GANG-I 1 OnA TUNING tee

1fA 11& 10A

1W.4t0a 1A'1111 10, t 1 to tt MTMIa 30. ttiIf4

Make voltage tests parative due to var

Plate 220 220

6 220 6 205 6 230 (A. C.)

r x x4

Cèá

cjsW1

sl

TRANSoRM[R7 MWCCL AN0U! UNITS MIT PR AlF TYPE 'MITMS}MI[(IYItML D[RIPTION RIRTNMItl

T TRAN{rORN,CR3 SPN DYNAMIC !P[ N[ A4[SI &0

I'0n/[NHA 00.4701 .N V VI&RATON 17-4734440 I e' RADIO r1[aYt11C7100-4711 1.00 sea V01aM1 C0R7ROL iNrKN- Mil Rei

1O3C1lLAT01 00-4704 44 J DIAL L1GNTJACK 17.4717 4 FIR3T I.1. 00.47041.7f P DIAL LIGHT cOMM[CTNIG PIN i04019 b)[COMO I.P 00471i171 9I 10.4711 .19

.4OUTPYT .A757 1.50II 91Y0 IT47N .I{ 71 OOw[R

1

.47i1I3Jf L DIAL LIONT 0- VOIT 11.3141 .11

,l741f9 .M' I

A AMMETER COMN[CTION

177#7e8 ,qS''. t 1-p (ILTCR

17.47i11 .55. 1?' 1ILTCR 17-4710 30'; 4' (11.014[17

s SUPR[SSION 91;M It CLCC) 01,174780 I.0011

004704 1.10 004{10 .41 004011 .40 0041/R .fa I. F. PEAK 170 K.C.

0 NOTE ros SILCMT TURING D1S- 000RCCT R4 NCRC ASID SCCORnCCT TO GROUND.

SOCKET VOLTAGES with at least 1000 ohm per volt meter. Voltages given in table are only com-

iance in battery voltage. Plus or minus 20% on all voltages is acceptable. Anode Grid.

Screen Cathode Triode Mate 1500 KC

100 2.3 50 - 175 100

100 220

2.3 3.5 18

230

POINT TO POINT RESISTANCES All readings taken to ground unless otherwise specified. Readings taken with all tubes, vibrator and speaker removed from set.

6F7 6A7 6B7

+ Heater Inf. + Heater Inf. + Heater Inf.

-- Heater 0 -- Heater 0 - Heater

Plate to B+ 100 Plate to B+ 82 Plate to B+ 120

Screen to B+ 25,000 Screen to B+ 25,000 Screen to B+ 25.000

Cathode 52 Anode Grid to B+ 20,000 Cathode 500

Control Grid 2,300.500 Oscillator Grid 101,062 Control Grid 82

Triode Grid 500,000 Cathode 52 Diodes 200,620

Triode Plate to B+ 250,000 Control Grid 2,200,500

.1nt. Primary 13 Ant. Secondary S

R. F Primary 100 R. F. Secondary 5

41 + Heater - Heater

84 Inf. + Heater Inf.

0 - Heater 0

Plate to B+ 625 Plate 196

Screen to B+ 0 Plate 165

Cathode ' 692 Plate to Plate 361

Control Grid 1.000.000 Cathode to B+ 165

COIL RESISTANCES Oscillator Primary 2 Second I. F. Secondary 120 Speaker Field Coil 55

Oscillator Secondary 4 Output Trans. Primary 625 Speaker Voice Coil 3

First I. F. Primary 82 Output Trans. Secondary 0.5 "B" Filter Choke 165

First I. F. Secondary 82 Power Trans. Secondary Second I. F. Primary 120 CT 165 & 196. Total 361

Ose. Grid 1500 Kr

Sto10

©John F. rider, Publisher


PAGE (i -L AMIN

MOD EL 7 Parts ,Changes NOBLITT SPARKS INDUSTRIES

MODEL 7

PART NO.

MISCELLANEOUS

DESCRIPTION PRICE

TRANSFORMERS & COILS

PART NO. DESCRIPTION PRICE 17-4294 17-4295 17-4701 00-4743 00-4529 17-1772 17-4732 17-4235 17-4231 23-44

Spark Plug Suppressor Distributor Suppressor Generator Condenser flame Light Filter Groand Clamps -

Dial Light 6-8 Volts tS, 'ew Base) Vibrator (4 prong) 6" Speaker Cone Assembly (in carton) 6" Speaker Assembly

$ .09 .50 .50 .50 .10 .15

4.00 1.20 4.00

00-4792 00-4791 00-4793 00-4794 00-4795 110-4757 00-4796 00-4754 00-4516

Radio Frequency Coil Antenna Coil Oscillator Coil Ist Intermediate Frequency Transformer 2nd Intermediate Frequency Transformer Output Transformer Power Transformer "B" Filter Choke "A" Filament Choke

$1.00 .90 .85

1.75 1.75 1.50 3.00 1.30 .40

12-566 } Stud and Nut (Set Mounting) .10

29-4664 Carton .60 17-2048 6A7 Socket .I5 17-2049 6B7 Socket .15 17-2045 41 Socket .15 REMOTE CONTROL PARTS 17-2047 17-4790 17-4736 10-4804 10-4810 10-4811 10-4844 29-4850 17-415.2.3 17-4760

84 Socket 6F7 Socket Vibrator Socket Speaker Front Screw, per dozen Flex Shaft Set Screw, per dozen No. 8x14 Self Tapping Screw, Hex Head, per dozen No. 8x516 Self Tapping Screw, Binding Head, dozen Worm Gear Drive Assembly Volume Control, 500M ohms Speaker Plug (3 Prong)

.15 .15 .15 .10 .10 .10 .10

1.00 1.00 .15

29-4673 29-4532 29-4533 29-4534 29-4538 29-4539 29-4527 29-4528 34-4540

Remote Control Without Bracket or Housing.... Metal Housing Eye Bolt and Nut Strap Dial Glass Steering Column Bracket Tuning Knob -Black Bakelite Switch Key Shank (lesa knob) (7-17-17A-27-37) Key Retaining Spring (7-17.17A-27-37)

$2.75 .25 .10 .05 .15 .20 .10 .05 .05

17-4797 Dial Light Pin Jack .10 17.4857 Dial Light (Bayonet Base) .15

FLEXIBLE SHAFTS

RESISTORS 00-4611 00-4642

Condenser Drive 6- length Condenser Drive 9' length

.46

.50

17-2060 17-2065 17-2088 17.2072 I7-2080 17-3011 17-4722 17-2068 17-2069 17-4788 17-9031

50,000 ohm Resistor, 1/4 watt 1000 ohm Resistor, (4 watt 500 ohm Resistor, 14 watt 20,000 ohm Resistor, 14 watt 1 Megohm Resistor. 14 watt 250,000 ohm Resistor, 14 watt 25,000 ohm Resistor, y4 matt 100,000 ohm Resistor, 1/ watt 200,000 ohm Resistor, 14 watt 2 Megohm Resistor, 1/1 watt Muter 3 Tap Candohm Resistor

.20 .20 .20 .20 .20 .20 .25 20 .20 20 .35

00-4613 00-4644 00-4645 00-4649 00-4616 00-4617 00-4648 00-4651 00-4652 00-4653 00-4654 00.4655

Condenser Drive 12" length Condenser Drive 16' length Condenser Drive 18" length -

Condenser Drive 21" length Condenser Drive 24" length Condenser Drive 30' length Condenser Drive 36" length Volume Control Drive 6- length Volume Control Drive 9" length Volume Control Drive 12' length Volume Control Drive 15- length Volume Control Drive 18-' length

.60

.70

.85

.95 1.00 1.20 1.40

.45

.50

.60

.70

.85 00 4659 Volmue Control Drive 21" length .96 00-4636 Volume Control Drive 24" length 1.00 00-4657 Volume Control Drive 30' length 1.20 01-4058 Volume Control Drive 36' length 1.40

CONDENSERS

17-2063 .002-600 Volt Mica Condenser .20 12-4702 .05-160 Volt Condenser .30 17-4731 .05-.05-160 Volt Condenser .35 17.4193 .02-.02-1000 Volt Condenser .60 17-0708 .5-15 Volt Condenser .45 17-4712 .10-.10-16 Volt Condenser .75 17-4714 .15-400 Volt Condenser .55 17-4759 .006-600 Volt Mica Condenser .25 17-4292 .001-600 Volt Mica Condenser .20 17-2211 .0006-600 Volt Mica Condenser .20 17-2064 .0001-600 Volt Mica Condenser .20 17-4798 3 Gang Variable Condenser 4.00 17-4785 .0005-.01-600 Volt Duni Condenser .50 17-4786 12. mfd 25 Volt Condenser 1.00 17-4787 2 & 6 mfd 450 V. Filter Condenser 1.23

DATE: May 23, 1935

MODEL NO. 7 SUBJECT: 1. R14-200 ohm 1/4 watt resistor has

been added in power pack across vibrator points.

2. R3-100,000 ohm 1/4 watt (17-2068) resistor in 6A7 No. 1 grid circuit has been changed to R29-50,000 ohm 1/4 watt (17-2060).

3. Dial light, part No. 17-2145 (with screw base), has been changed to dial light, part No. 17-4857 (with bayonet base).

4. Speaker plug 'socket, part No. 17-4761 (3 prong), has been changed

Circuit Changes, Model 7 to speaker plug socket, part No. 17-4447 (4 prong).

5. Ammeter cable, part No. 00-4778-1, has been added. List Price, $ .70.

6. Fuse, part No. 17-2228, has been added. List Price, $ .05.

7. It was found in the field that in some instances motor noise entered the receiver where the local -distance plug and tone control plug were attached. A change in the mechanical design which eliminated this diffictulty was made beginning with those sets from which the louvers were ommitted.



ARVIN PAGE 6-3

biCI1EL 7

ANTElltA - CCNIPC-OR

T2 *00-4'92 R COIL

T1 4.00-4791 ANT. COIL

CIS 17-4714

154r7 400v. R3417 -2C68 100,000n }WATT

C17.4 -05rÿ 160V

C 17 9--05.9( 160V.

417-4'331 ',WIN

C 13A-.iuf 15V

C13B-J.ÿ 15V

417-4712 TNIN

07 417-20.í4 .0001uf600V. J 028 *17-4786 124,725V ELECT

R23417-3011 250,000^ * WAT7

C264 17-4739 .006uf 600v. R941? -2080 1MEG.0 ;} WATT

C 27A -.01uf 600Y

C 27 9-32005940OV 417-4785 OU AL

C29A-Zuf 300v.

C29E-6.rf 500v.

417-4787 D11AL ELEC.

NOBLITT SPARKS INDUSTRIES

T 3* CD -479J tXSC- r10 L

X3 403 31E

¡Q'FILTERcIOIC

S1P3RE3SIO13 8C)(

} 5 # 00 -4782 C MCt`E

T4 * 00-4794 -",, C8417-2063,.002.1red0\

1 iT 1. E COIL .24UAL. - CONCENTRIC FADOER-

687 TUBE

R25,5WI*I7-41523 500,0000 VOL.

CONTROL i SWITCH

T5*00-4795 251 1. F.00IL7SINOLE

PA70ER

CIO*17-4702 160V.

T `7. * 00- 4793 05C. COIL

76 400-4757 OUTPUT TRANS.

C274,[276,417-478

01rf-0005160OY, 77 400-479E POWER TRANS.

V 417-4732 VIBRATOR

C 234E17-4108 5of I5V,

C 234417-4708 .5.47( 15.

Jr 17-4797 1-OISLUGFT

DI %L LIGHT!ACM r

T.t00- -l96 44 400-4515

P241eR [FANS. EIL» ENT CHOKE

G MD. T ,RM.

Chassie Layouts

T4 4 CO- 4,-,34.

!T I.E COIL +-

K 20.417-4-Z 25,COCA WAIT

CIS *11-47 5.7 400V

810 417-20 S03n *WA

-5 *00-<7 ..52I.FCOL 1d4 *17-2069

200,O00n ,} 1rqTT

F2'r4I7-4735 MEG.n 4NhTT

Cb 417-2?1 .00054760C4. 010 uÁ17-47

o5af 1601.:

F7 M17.297i 0,0000 T MATT

C9417-<252. Gol, f 6o0y. R 30A- 5:t*

F 308- 6400- F7.3031 CAN11014M

R 24 ä 17-204S j, tali, -' WATT

R29*17-2D6ï 50,0000 *WANT

C 23417-4-705 Suf 15

- C 1 E,CtGá,CSß,* r[ -4R98 CANO VAR .CCNDEN9ER

6A7 TUBE

61,7 TUSE

-E5'54'VOL-AGE

4.1 TUSE

C I:8417 -478i r2 af 25V. FIE

1C i 400-4-54 D" FILTER CMOC =

r- TUBE

T 51*17-471.1 L 3F EhKERSCCM[T

Ci94- 2.y1 530V.

- C399- 6.v/5FOV.

-411-4787 &Ai ELEC.

(Wohn F. Rider, Publisher


PAGE 6-4 _11ì1'IN

1035 Receivers Installation Data


INSTALLATION PROCEDURE FOR 1935 ARVIN CAR RADIOS

There are several things which should be done CARE- FULLY as a car radio is being installed. Care in making the original installation will pay for itself, particularly if you find it recessary to do additional work because of motor noise.

Some of the major points often overlooked are: 1. The set must be well grounded at the place where it is

mounted. Scrape the paint off around the mounting holes drilled in the car so the nut and washer will make contact with a clean, bright surface.

In some cases where the bulkhead is padded on both sides, it will be necessary to run a piece of shielding from one of the mounting bolts to some NEAR- BY point where a good ground can be made.

2. In the case of a roof antenna, the antenna lead should be shielded continuously from the set to a point as far up the corner post as possible. Unless the set is mounted on the opposite side of the car from which the antenna lead comes down, the shielded lead supplied will be sufficient. Solder the antenna lead to the shielded lead supplied, tape neatly, and take up any slack by pulling the shielded lead out through the shielding on the connector end. Cut off the excess wire and solder the bakelite button back in place. Push the shielding as far up the corner post as possible and ground the shielding at the point where it enters the corner post.

3. In the case of under -car or running -board antenna, the antenna should preferably be installed so it will clear the car by a few inches. This distance will be governed by a sensible allowance for road clearance, depending on the type of antenna used. It is good practice to shield the antenna lead continuously from the set to a point close to the antenna, grounding the shielding wherever convenient.

4. When installing the remote control, and excess length of tone control cable, and in installing the No. 37, the local -long distance cable as well, should be neatly coiled and taped in place up under the dash out of sight. It is desirable to ground the shielding on these cables at this point also.

5. In some cars a metal tube-supplying the windshield wiper-goes up a corner post. This should be grounded as near the corner post as possible.

8. When installing the dome light filter and generator condenser, be sure that each unit has a good, clean ground connection.

7. When the receiver has been completely installed, turn the set on and tune in a station whose frequency is known. If necessary, remove the small screw in the center of the dial face and with a toothpick or other small implement turn the pointer to the correct frequency. Replace the small screw.

Start the motor (remember that exhaust gasses are dan- gerous in closed garages) to determine whether the installation is nicking up motor noise. The 1935 Arvin Car Radio is so constructed that on the majority of new cars spark -plus suppressors are not necessary. However, on some of the older cars as well as a couple of the more popular new ones, suppressors will be necessary to eliminate motor noise. These suppressors Can be obtained from your jobber.

Some general instructions are given here any one or combination of which has been found very useful in the elimination of motor noise which can be classified as of two kinds:

1. The so-called "feed-back" and radiation, which is audible when the aerial of the set is disconnected.

2. Antenna Pick-up, or motor noise that is heard when the aerial is connected.

I. If motor noise is heard with the antenna disconnected, try the following, leaving the antenna disconnected until the noise is remedied:

First: Run a bonding wire from the dial light and tone control cable shielding of the remote control to the set itself, thus insuring a good ground for the shielding on that cable. It. can be determined whether or not this cable is bringing in motor noise by pulling out the plug where it plugs into the set. If the motor noise decreases, it will be necessary to ground this cable as it is bringing in motor noise.

Second: Place an ammeter condenser on the ammeter of the car.

Third: Place a condenser on the ignition switch. Fourth: Peen out the rotor of the distributor or build

up the rotor with solder until the gap between the rotor and the distributor cap is .003 of an inch.

Fifth: If the primary lead to the coil and the distributor run through the same conduit as the spark -plug wires themselves, remove these primary wires from the conduit and keep them as far away as possible from the spark -plugs or high tension wires.

Sixth: Inspect the distributor points, and if they are badly pitted, replace and reset.

Seventh: On Ford V-8 installation, the generator condenser, furnished with each set should be placed on the distributor.

II. For the second kind of motor noise, namely Antenna Pick-up, that is, when the antenna is connected to the set, the following methods may be tried for its elimination:

First: Change location of the dome light filter to the dome light itself.

Second: Place condenser on ammeter.

Third: If the coil is on the passenger side of the dash, shield the high tension lead running from the coil to the distributor and ground this shielding at the point where it passes through the bulkhead.

Fourth: Ground the motor to the frame on each side of the motor.

Fifth: Bond the choke and throttle control rods to the chassis of the car with flexible wire or bonding material.

Sixth: Ground the steering column post to the instrument panel.

Seventh: Ground brake and clutch pedals on motor side of bulkhead to some metal part of the dash.

Eighth: On some cars you will find that the battery lead from the battery to the starting motor radiates through the foot board and any person directly over the battery lead will carry that radiation directly to the antenna. This difficulty may be overcome by placing a copper screen under the floor mat, and grounding this screen to the frame of the car.



ARVI\ PAGE 6-5



PAGE s -s ARVIN

MODEL 16 Installation Data Farts List


OFH

CO

d mI~ m

I r -i ' CO ,4 I ri imi3

+3

+W.

, m Çm

P

p G.m1

H U ri +' c+'

+' ~ 9, LI r k r+ O.O +' . .4-1 4 O O CO m OW

41 a o G od m ?{+'O

W .4 ri U+' O~W d m 4-+ O ri R' +' CO m

Cl U co m 4- U ..4 mg+' 'd r -i U wp

O P. gr+ m

ri Pt. d 1 m +' m P d

o m H U Q zJ O

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+ +a m ..ambPNSm4 r-+hD

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CO d d +' d ri O E +' '0 m o

.

U H +' O m co F+ O co d Tf +' .0m

P. p., d ti .` + m m o r+ W+' W U D-+ .>~ I Li o m 4+ U CO U G) .0 o -r+ ro m G) d

+' d co O d O. d m F.-0 s~ +' ] .0O r -i 4-1 >~ m VI +2 m +' .i: r-1+" i, R. > .r -1r+ -P +' +' o 0 H rj W L, W mA O S P. f~ >~ q +' C O

+ O .4-1 m o 7> .1,', 4:4': 0) SC ri O a a m ,ßr+'

VI Ó k km ír Á Ó 42 ri C) T d

r' +2 OL SW r 4242.0 0 .P

.~ U t>.0 a +' COW m +' U+' ,]0 4i4

-d .-0 *Hf e Gdr

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td .i Lr Nri +' d .C, +' L Z a l' i .0 W W .r-+ .~ O W O .4-4 * + -i m Ó

U + i CH m + m rj

Hci., -I .c; il -P i O m r m ' m

d D O + d r-1 d o i `' P-. .

H e 4, co +' ór+' .0 md m * ti x -ri D 1rn

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W P: m to d o m *Ó m' d U7 CO , C/D m O ri +' >-. m r+ ri f~ ..W H W W Ó P, +' P.

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q Li Fa r -i Li H +' CO r-4 r-+ O m m U +' +' Li +' * H d r-1 O d rn G7 O d +'

., +' © ,_ W W r--. d W

y q p,

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H r+ m ,, W W W +'r--1 , O S -P m .0 4- . O U d O m G> C m..O +' 0 a) d --I 'd d ri m (. O m cd Li +' U O L.0 +' d ti E. 'd +' e m o

W W+' -I-2 'd UO .+' fi

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.') V C'+

'7'1 -f' r- r



ARVIN PAGE 6-7


I.F. PEAK = 175 K.0 ARVIN CAR RADIO- MODEL IT 78 6707 78 75

/

äs

C tl14

a

53 %4 ' CSIt15

T5

I y +

c

R115

X7

>0 t1i C 705 C 104

5 I I

51

IgODZ, 17 Schem.atic,Voltage P.esistances,Farts

For Chames, 41 see Index

/ !\ 1Sw1 P5 P1

9w1 -g

Rcc

R esose

7- 400

100, 200, boon Soon

Ince Soo

78n

Bóó

./4 Ia 1/4 14

1/4

I/4

Ys

ReS1ZTOR5 PART HO

17-47.2 11-1040 R--1049 Remo IT-1oTl .7-2071

T10eo 17.20B5

11.2042 r7 -412»T TT 4117

PR1Cq

.20

20

.10 20

.15

IB 10

20 21 72 la 24 15 16 27

mens 5 O1q

000M

i1

V.C.

PART Tao

IT 4T10

8.452 0

t MAY St 100010 CORM., bW611

CROS

140

C c4PpcITY

.002 0001 .0006

05

15T

IYTMIM

IS

VOLT

500 400 000 000 leo

400

400

CONOENSER9 Parr to

,.4745

17-200ü ,-Ta44 R- 2111 n-4101

IT -4701

7- 41II 8,41.1

n-41.4

t'dCK,

4.50

10

55 15

55

C CAP4C IT V

.02 wN atr oo OOe 00

VOLT GOO

140

16

50o

.5

elc600

400

CHOKES 3 7124416F0141.16/38 PART NRe4I06F 17-4115

15 4741

IT4TCT

IT -4100

.7.4191.

IT4Toe 17'4TO4 n-474$ 17-4T69

ISo

140

.55 15 .15

2

4

á

>L. *2 YS M-4

TV P6 4

RA010 PRROUEHCY oeclLl1-TOR- FIRST F eccone 1.F. 0 00,4Eß0

B' P1L3-46 CKOKR FILTtE CMOKa

1LAMRMT C,10K!

PAETRO,PRICB 004510 p 004511 004548 u04eIT 004514 00-4TS7 004740

OP4154 4510 4015

1.00 .eD 75

175 150

0.00

1.90

.4o

MnOsl M 16 CELL 4NEOUS UNITS

O65CRIPT.O44 SPE4KER VIBR4TOR

RenaTE con-tem. oROunO VOLun! cONTaOL 3441TCw Teets CONTROL 901Tcw SPEAKlR SOCKaT pAl L1TE -TOME SOCKET 1.0C:OIS,.COn71Cl SOCKRT S0041(E12 vLu4 014L- LITE -TOME vwe 1.4,0; 01ST Con7ROL owe PIA L LITR 6-8 VOLT 4n.3T411. CONTACT wn

SOCKET VOLTAGES ake voltage tests with at least 1000 ohm per volt meter. Voltages given in table are only comparative due to variance in battery voltage.

Plus or minus 20`,-(.. on all voltages is acceptable.

Tube 78

6A7 78 75 41 84

Heaters 5.8 5.8 5.8 5.8 5.8 5.8

Plate 220 220 220 115 208

230 (AC)

Screen 70 70 70

220

Cathode 3.3 3.3 2.5 1.5 14.0 225

Suppressor 3.3

2.5

Anode Grid 1500 KC

POINT TO POINT RESISTANCES All readings taken to ground unless otherwise specified. Readings taken with all tubes,

vibrator and speaker removed from set. 78 (R. F.) 6A7 78 (I. F.) + Heater Inf. + Heater Inf. + Heater Inf. - Heater 0 - Heater 0 - Heater 0

Plate to B+ 113 Plate to B+ 115 Plate to B+ 85

Screen to B+ 5p000 Screen to B+ 50.000 Screen to B+ 50,000

Anode Grid to B+, 20,000 Suppressor Grid 400 Oscillator Grid 100,400 Suppressor Grid 500

Cathode 400 Cathode 400 Cathode 500

:Control Grid 1,250,000 ;Control Grid 1,150,000 ;Control Grid 1075,000

75 84 -F Heater Inf. + Heater Inf. - Heater 0 - Heater 0

Plate to B+ 200,000 Plate 196

Cathode 5 000 Plate 165

;Diodes 150,000 Plate to Plate 361

Control Grid V. C. on 1,000.000 Cathode to B+ 165

Control Grid V. C. off 500,000

COIL RESISTANCES Ant. Primary 12.0 Oscillator Primary 3.0 Second I. F. Primary 85.0 .Ant. Secondary... . . . . 40 Oscillator Secondary 1.5 Second I. F. Secondary.,... ----- 85.0 B. F. Primary 113.0 First I. F. Primary 115.0 Output Transformer Primary 625 R. F. Secondary 40 First I. F. Secondary 115.0 Output Transformer Secondary.... 0.5

Ose. Grid 1500 KC

175 5-10

41 + Heater Inf. - Heater .... 0

Plate to B+ 625

Screen to B+ Cathode 500

Control Grid 500,000

Power Transformer Secondary {1.361 Speaker Field Coil 5.0 Speaker 0i42, t]III 1.0

"B" Filter Choke 165

Readings given for sensitivity in Local" position, for --Distance' add 5000 ohms.


PAGE G-8 ARVIN

*.2:or,2, 17 Chassis Layouts NOBLITT SPARKS INDUSTRIES

C13Á -13B 10-JÒ14F0. 15 V.

17-4712

C17Á -17B 05 -05 MFD.160V. 17-4731

C 7-0001 MFD.-600V. 17- 2064

C 9-AOI MFD.-600V. *17-4292 R26- 60011 *17-4781 R3-10pp0pn 017-2048

C I2 -.25 MFD.-400V. *17-4711

R 18-501000í *17-4720

C 26-A06MFOr600Y. *17-4759

R15- 500-n * 17-4717

C22A-228 A2 -A2MFD-1000V. 17-4193

C 20A -20B 4.0-I2;0MfD-500V.

17-4703

CONNECTOR

R3-100,00011 *I7-2068

T7 - POWER TRANSFORMER. *00-4796

C15-.15 MED. 40oV *17-4714

C25- .003 MFD-600V. 17-4741

C6 - .002 MFD.-600 V. *17-2063

R fit -200011 *17-4202

X4- FILAMENT OK_ *00-4515

R9- 1MEG.n *17-2080

C8- 0005 M F G. -600V. *17-22u R9-1MEO..n *17-2080

R13- 75,000n *17-2067

C194-198 12-12MFD:25V 17-4707 R7- 2o,000n *17-2072

CIO -A5MFD:160V. 17-4702 R6- 5,00011 *17- 2071

R4- 200,000n *17-2069 RS -500,000n *17-2070

C16- IOMFD.-600V. 17-4715

X3- p1" FILTER CMOItE

R14- 20011 *17-4287 C24- 1.OMFD.-15V. *17-4709 C23- .50MFD.-15V. *17-4-708

2ND 78 TUBE -1.F.

' C-19 A- 1_ g

R25- 500,000A. VOLUME CONTROL *17- 4152-3

T5 - 2ND. I.F. COIL *00-4514 RS -500,000A *17-2070

T6- OUTPUT TRANSFORMER *00-4757 C10-A5MFp.-16ov. * 17 - 4702

8+ TERMINAL FOR TESTING

75 TUBE '

VIBRATOR *17-4732

C24-1.OMFD.-15V *17-4709

C 23-.SOMFO. -15V. *I7-4708

74 -IST. LE COIL 00-4517

X 2 -'B'FILTER CHOKE *00-4754

C6 -.002 MFG 600V. auT 2063 X 5 - SUPPQESSION C1IE1Ké OO- 4782 13-03CILLATOR COIL *00-4518

SPEAKER SOCKET SI *17-47E4

T2-R.F.COIL *00-4511

TI-ANTENNACOIL * 00-4510 CIA- 2A -34 -VAR CONDENSER rí7-4745 6A7 TUBE

IST. 78 TUBE - R F.

C16-.IO MED. -600V. 17-4715

C12-,25MFD--400V. * i7-4711

41 TUBE

T7 - POWER TRANSFORMER *00-4796 84 TUBE

C 20A-208 4.0-12.0 MFD500v * 17 - 4703

bJohn F. Rider. Publisher


ARVIN PAGE 6-9


MODEL NO. 17

1. R3-100,000 ohm 1/4 watt (17-2068) resistor in 6A7 No. 1 grid circuit has been changed to R29-50,000 ohm 1.4 watt (17-2060).

2. R24-1,000 ohm 1/4 watt resistor has been inserted in 6A7 No. 1 grid circuit.

3. R2-400 ohm 1/4 watt resistor has been changed to R10-500 ohm 1/4

watt. Allowable variations on R2 was from 200 to 600 ohms. Allow- able variation on R10 is from 400 to 600 ohms.

4. R10-500 ohm 1/4 watt resistor on cathode of 78 tube has been changed to R28-1,500 ohm 1/4 watt.

5. C12 and C26 capacitors have been combined into one dual condenser, part No. 17-4742, .006 mfd 800 volt (lead with red dot is .006 mfd unit) and .25 mfd 400 volt.

6. X5 suppression choke, 00-4782, has been added in "A" line.

MODEL NO. 27

1. R3-100,000 ohm 1/4 watt (17-2068) resistor in 6A7 No. 1 grid circuit has been changed to R29-50,000 ohm 1/4 watt (17-2060) .

2. R24-1,000 ohm 1/4 watt resistor has been inserted in 6A7 No. 1 grid circuit.

3. R2-400 ohm 1/4 watt resistor has been changed to R10-500 ohm 14,

watt. Allowable variation on R2 was from 200 to 600 ohms. Allowable variation on R10 is from 400 to 600 ohms.

4. R10-500 ohm 1/4 watt resistor on cathode of 78 tube has been changed to R28-1,500 ohm 1/4 watt.

5. C12 and C26 capacitors have been combined into one dual condenser, part No. 17-4742, .006 mfd 800 volt (lead with red dot is .006 mfd unit) and .25 mfd 400 volt.

6. X5 suppression choke, 004782, has been added in "A" line.

7. C6-.002 mfd mica condenser has been inserted ahead of X5 suppression choke and connected from battery side of X5 to ground.

r,. Power transformer, 00-4747. Part number has been changed to 00-4746.

9. Dial light, part No. 17-2145 (with screw base), has been changed to dial light, part No. 17-4857 (with bayonet base) .

10. Speaker plug socket, 17.4761 (3 prong), has been changed to speaker plug socket, 17-4447 (4 prong).

MOD3,S 17,27 Changes

7. C6-.002 mfd mica condenser has been inserted ahead of X5 suppression choke and connected from battery side of X5 to ground.

8. Dial light, part No. 17-2145 (with screw base), has been changed to dial light, part No. 17-4857 (with bayonet base).

9. Speaker plug socket, 17-4761 (3 prong), has been changed to speaker plug socket, 17-4447 (4 prong).

10. Ammeter cable, 00-4778-1, has been added. List Price, $ .70. Note: On Model 17A this cable is

shorter and carries part No. 00-4778-2. List Price, $ .65.

11. Fuse, 17-2228, has been added. List Price, $ .05:

12. It was found in the field that in some instances motor noise entered the receiver where the local -distance plug and tone control plug were attached. A change in the mechanical design v,-hich eliminated this diffictulty was made beginning with those sets from which the louvers were ommitted.

11. Ammeter cable, 00-4778-1, has been added. List Price, $ .70.

12. Fuse, 17-2228, has been added. List Price, $ .05.

13. Beginning with serial No. D44011H the type 75 tube was replaced with a 6B7, triode connected.

14. C25-.003 mfd 600 volt condenser was changed to C26-.006 mfd 600 volt.

15. Beginning with serial No. E45219H, the triode connection on the 6B7 was changed to a pentode connection, and changes as per paragraphs 16, 17, and 18 were made.

16. C12-.25 mfd 400 volt condenser was added as a screen by-pass from screen of 6B7 tube to ground.

17. R9-1 megohm 1/4 watt resistor was added as a screen dropping resistor from +B to screen of 6B7 tube.

18. C26-.006 mfd 600 volt condenser was changed to C25-.003 mfd 600 volt.

19. Under conditions outlined in paragraph 15, voltages on the 6B7 are as follows (using a 1333 ohm per volt meter) : Plate 60, Screen 30, cathode 1.7.

20. It was found in the field that in some instances motor noise entered the receiver where the local -distance plug and tone control plug were attached. A change in the mechanical design which eliminated this difficulty was made beginning with those sets from which the louvers were omitted.


PAGE 6-10 ARVIN

i:IODEL 35 Above Serial E31577ä Vol tac e, Resistances

o

z ç w Mr w.

m S14 p°: o

I I I I

ê° °ffi xxmr* xx°f

VCV M+IP.UV òA W r- : z CL -g z v Eo a

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r Oti~O tAÑ

y 2 Y V Si

3 .g ó ó o cv e o co Al, 2

W.cS cV x aa ..

CU q q ^Ó q + á ir É and o F; .Z a, c eQ Y E. 'pp o o V) R' Ñ'3

411 o q Ó I..I m .b .b B V«

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00 p 6,. 7) V V V u V o N. V I. . ri m V

G: ' d u m:.' ó ó a xx ro aL o» `--ov.. 3 >' ° á, 3,t.- <._._ oa °_ ° a.°F- w

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á á'3 p w o 4 SS

ppp ,y i Ca > .G UTwyJ ÑO000 ONÓ I+jNDOONtrc

N > ti O Ó rim .r . C

m u7 N.. ho E.I.vo I O c, M á rÒ 9 tº á O F-

° o> ácol U

F- > oa, m -o... O

7:i Ac Oo-e m ea ór .o Y V ato f-

á 3,âc`nicHcii-Mi M A o :L5' e'(«9

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áº Q 2 m°º ó o.rña)cl:cnO iti Sxx a c x...1« M Fx i e° .r Óo a o ol+ 1.47X(2.1,1..9 eM+ I ß.cnUU -U4.;140"Ó91 >ô

' > -0+3+

V. }}ee

etl 7 ..;000O^QQ yiOv+Nss

ao .. S.-cir:4-4`



ARVIN PAGE 6-11

TI

nA

03

NOBLITT SPARKS INDUSTRIES MODEL 27 Schematic ,Voltage Resistances,Parte

AQVIN CAQ QADIO - MODEL 27 78 GAT Tel 73 Al i ------/--------7

T4 T3 / - rg -, 1 T1 It

I ss¡ $ ! II"``

fff---L---...

I 88 1

L_ C Z /Tw gaj L _ J

1 -4

C C 170

º3

C 3

rs R

00 M7= C

aro)

R 9 a

R m

C C

C

- I CZ5 C 190

03I`7 pi5 917

TG

11

e

3

vieQATo¢ / 514

C s14 X3 X4

CS5OOOGT

C

XZ

]05

d A

8 500

1.F. PEAK = 175 K.C.

0E5157003 CONDEHSE¢5 CHOICES AHDTQAH5P0ºMEQ5 MISCELLONEOUS UNITS San no V¢ICE

w tear 1v0 ROCS C CAtMCITV I.OcT OWPTIa PnKE C 1CAl11CI1Y \cxTbAlT.gYlKa Se TYp6 Mlr l+oe.eKatJYM4 OESCQIPTION ipa4laatE Iñ-e +Yly a o003

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4

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1e aOM I 0F4155 .70 144 153 '14 4 00 11-413047as

IT 7e0 1 1,4110 .00 - IO .15 A00 I.,,,,,,,.aP .000 .1

SOCKET VOLTAGES

Make voltage tests with at least 1000 ohm per volt meter. Voltages given in table are only comparative due to variance in battery voltage.

Plus or minus 20% on all voltages is acceptable.

Tube Beaten 78 5.8

6A7 5.8 78 5.8 75 5.8 41 5.8 41 5.8 84 5.8

-78 (R. F.) + Heater Inf.

- Heater 0

Plate to B+ 113

Screen to B+ 50,000

Suppressor Grid 400

Cathode 400

*Control Grid 1,250,000

41 + Heater Inf. - Hater o

Plate to B+ - 330

Screen to B+ o

Cathode 250

Control Grid 250.000

Ant. Primary 12.0

Ant. Secondary 4.0

R. F. Primary 113.0

R. F. Secondary 4.0

Plate 235 235 235 120 220 220

260 (AC)

Screen 75 75 75

235 235

Cathode 4.2 4.2 3.3 1.7

13.0 13.0 245

Suppressor 4.2

3.3

Anode Grid 1500 KC

170

POINT TO POINT RESISTANCES

All readings taken to ground unless otherwise specified. Readings taken with all tubes,

vibrator and speaker removed from set.

6A7 78 (I. F.) 75

+ Heater Inf. + Heater Inf. + Heater Info.

- Heater ' - 0 - Heater 0 - Heater

Plate to B+ 115 Plate to B+ 85 Plate to B+

200+000

Screen to B+ Screen to 8+ ¡Diodes150,000 Anode t6 B+ 20.000 Suppressor Grid 500 Cathode r OscillatorodeGrid 100,E5000Cathode 500 Control Grid V. C. on 1000,000 Cathode

Grid 1 150,000 *Control Grid 1075,000 Control Grid V. C. off 500,000

84 Inf. + Heater Inf.

O - Hater 0 330 Plate 240

O Plate 210

250 Plate to Plate 410

250,000 Cathode to B+ 165

1/ee. Grid 1500 KC

î-10

41 + Heater - Heater Plate to B+ Screen to &} Cathode Control Grid

j Add 50011 0 to these readings when sensitivity switch is on "Distance" position.

COIL RESISTANCES Oscillator Primary 3.0 Second I. F. Primary 85.0

Oscillator Secondary 1.5 Second I. F. Secondary 85.0

First I. F. Primary 115.0 Output Transformer Primary 330

First I. F. Secondary 115.0 Output Transformer Secondary.... .05

Power Transformer Secondary 4T-210=450

165 4.0 3.0

"B" Filter Choke Speaker Field Coil Speaker Voice Coil



PAGE 6-12 ARVIN

:.: II, 27 Chassis Layouts

C *17-4714 15 MFD, 400V.

C 7 I7-2064 100M MFD. 600V.

T3 *00-4512 OSCILLATOR COIL C9 *17-4252

01 MFD 600V, 6A7 TUBE

T2 00-4911 RADIO FREQUENCY COIL

ANTENNA CONNECTOR

Ti #00-4510 ANTENNA COIL R3 *17-206: 100 M -A- 1/4 WATT C13A-C138 * 17-4712 .1-.1MFb 15 V,

C 17A - C178 *17-4731 .OS -OS MFD. 16OV. 78 TUBE

RI6 *17-4763 50M -R.1 WATT R26 *17-4781 600 n R 24 1000.- R3 100Mn

250MA- CI6 O.i MFO.

25MFO.

WATT * I7- 20E I. WATT * I7-2048

Y4 WATT

*17-3011 /4 WATT

*17-4715 600v.

C26 *I7-4759 .000 MED. 600V. 41 TU8E5

84 TUBE

jJ ç20A-C208 .17-4703 111f6

4-12 MFD. ELECT 500V. Y 1

X3 *00-4516 "A" INPUT CHORE

C22A-C228 *17-4193 .02 - 02 MFD 1000V.

C6 017-2063 .002 MFG 600V. X 5 # 00-4782 SUPPRESSION CHOKE

1114 - 00-4517 15T IF TRANS.

78 TUBE

C19A-G198 w17--4707 12 -14 MFD. ELECT. 25 V. : P4.`I R25 417-4152-3 ,1.} 500 Mt,VOL.CONT. R5 *17-2070

1W.


500Mn T5 2 110 i F

C4

V WATT 00-4514

TRANS.

*17-4728 00022 MED

CIO

PA O.

17-4702 .05 MFD 160 V

T6 a100-4756 OUTPUT TRANS

75 TUBE

V *17-4732 VIBRATOR

X 2 "B" FILTER

C 23 .5 MFD.

C 24 1.0 MFD

* 00-4754 CKOKE

*17-4108 15 V.

407-4709 15 V.

*

R7 217-2072 20 Mn Y. WATT

P3 LOCAL- DISTANCE CONT ROL PLUG

C 25 17 4741 .003 MFD 60OV. CS *17-4700

OD11 M F D. 600 Y C4 * *17-4726 .00022 MED. PAODER

$2 TQNE-P1401 53 LQÇAL-DISTANCE *17-4375

R11 017-4102 2000A- Y4 WATT 74 000-4517

1; S1. IF TRANS. C6 *17-2063 .002 MFD. 600V CE 17-2211 .0005 MFD. 500V.

1-2050 IMEG Y4 WATT

78 TUBE

RIS *17-2067 SMn. 1/4 WATT

CIRA -0198 *17-4701 12-12 MED. ELECT. 25V.

T5 *00-4514 2NO IF TRANS.

CIO *17-4702 05 MFD. 60 V. 96 *17-2071 5000/1 ». WATT

75 TUBE R4 4.17-2069 200MO. 144 WATT RI? *17-4715 250,, 2 WATT V *17 4732 VIBRA

R14 oR

*17-4287 200., 1/4VVAr'

T 7 *00-4746 POWER TRANSFORMER C24 *17-4109 1.OMFb. ISV. C23 *17-4708 .5 MFD. 15 V

X4 *00-4515 FILAMENT CHOKE

c13 * 17-4714 13 MEO 4-00V. T 2 * 00-4511 RADIO FREQUENCY COIL

TI * 00-4510 ANTENNA COIL

c1 -C2 -C3 */7-4725

T3 *00-4512 OSCILLATOR COIL

6A7 TUBE.

78 TUBE

TEST +8 HERE.

* 11-4711 400V.

7 -4715 600 V.

41 TUBES

77 * 00 -4746 POWER TRANSFORMER

84 TUBE

C20A-C208 017-4703 4 -12 MFD. ELECT. 500V

SI *17-4751 SPEAKER SOCKET

J



ARVIN PAGE 6-13

ó ,4r10

ra

221+

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GAT

C- 24

SCt1EMATIC CIRCUIT DIAGRAM ARVIN CAR RADIO MODEL. -37

y %4

C 8132

GDT

!Is

rr1L _--

76

R 5 R

C

MODEL 37 Schematic ,Voltage Resistances, Farts

76

For Changes, see Index

x- l

41

41

IF. IPEAK . IT5 KC.

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PART Hía'RICL

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Ot3CRIPTION PART IR 59*550R 17-4254

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0'15

SOCKET VOLTAGES

Make voltage tests with at least 1000 ohm per volt meter. Voltages given in table are only comparative due to variance in batter)

Plus or minus 20% on all voltages is acceptable.

Tabe 78

6A7 6B7

let 76 2nd 76

41 41 84

78 Inf. + Heater

0 - Heater 13 Plate to B+ S

351 1113

Screen to B+ 400 Suppressor Grid.. 400 Cathode

*Control Grid .... 1.250,250

2nd 76 Inf. + Heater

0 - Heater 000 10. Plate to B+ 100 Cathode

500 100 Control Grid

Heaters 5.8 5.8 5.8 5.8 5.8 5.8 5.8 5.8

Plate 170 170 170 100 165 230 230

260 (AC)

Screen 75 75 75

235 235

Cathode 4.0 4.0 2.0 4.7 5.3

18.0 18.0 245

Suppressor 4.2

Anode Grid 1500 KC

135

POINT TO POINT RESISTANCES

All readings taken to ground unless otherwise specified. Readings taken with all tubes,

vibrator and speaker removed from set. 6B7 lot 76

Inf. 6A7 Inf. + Heater Inf. + Heater

Heater 0 - Heater 11 - Heater 3 - Heater 5 Oí15 Plate to B+ 60,0)0

Platec to B+B 5000 Platec B+ 30000 Cathode 2 0 0

e to + 30,000 Screen to B+ 1501250 Control Grid V. C. on 750.01)1

Anode Grid to B+ 25,000 Cathode Oscillator Grid 100,400 Cathode Osct

500 Control Grid V. C. 111[ 5Oí1.())1 '

JP

7'ultage.

Ose. Grid 1500 KG

5-10

Cathode 400 *Control Grid 1075,250

*Control Grid 1150,250

41 41 Inf. + Heater Inf. + Heater

0 - Heater 0 - Heater 220

Plate to B+ 250 Plate to B+ 0

Screen to B+ 0 Screen to B+ 400

Cathode '

400 Cathode 400 Control Grid 750 Control Grid

t Add 250 0 to these readings when sensitivity switch is on "Distance' position

COIL RESISTANCES

Ant. Primary 12.0 Oscillator Secondary 1.5 Output Transformer Primary

Ant. Secondary.... 4.0 First I. F. Primary 93.0 260-CT220=470

R. F. Primary 113.0 First I. F. Secondary 93.0 Output Transformer Secondary.... 0.4

4.0 Second I. F. Primary 85.0 Power Transformer Secondary

Oscillator Primary. .. R. F. Secondary .

3.0 Second I. F. Secondary 85.0 240CT-210-450 ,

84 + Heater lof. - Heater 0

Plate 240

Plate 2111

Plate to Plate 4.50

Cathode to B+ 165

"W' Filter Choke 165

Audio Input Choke...750-Cf-óg0=1430 40 Speaker Field Coil 2 Speaker Voice Coil



PAGE 6-14 ARVIN

MODEL 37 Chassis Layouts

72 400-4311 R F COIL

CT lOD M MF D.

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17-1954 sop

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76 00-47 OuTPuT TRAP

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417-4702

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76 TUBES IST ANO 2ND A.F

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C 18 417-4715 1 MFD. G00v V 417-4732 VIBRATOR

C 25 17-47.8 SMFD 18v

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K 2 00-4734 FILTER c HONE

NOBLITT SPARKS INDUSTRIES 4 N

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32-i-3 417-4375 LOCAL- DISTANC!-TON. PILOT

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417-47i7 130.n- +/4 wAT r e7 -ruße ND. IF AMP -D27

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Cº. .II7-g1oy 1.DMPO. IS V

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17-4592 160V

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647 1-11 21.____ MIX

K1 000-4158 AUDIO INPUT CHOKE

78 TuBE. RF MPLI llq -

C16 17-4715 .1 MfO. OE_Ov- CI I 1T-4710

4OMFD.' 400v

TEST +5 HERE

41 TUBES POWER AMPLIFIER

77 *00-4747 POWER TRANS

a TUE 41.4.B ECTIPIER

EWA -621B 1117-4716 12 12 MCD. SODv.

S 1 417 -4447 SPEAKER SOCKET


ARVIN PAGE 6-15

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PAGE 6-16 ARVIN

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ARVIN PAGE 6-17

MODEL 45 Above Serial E403561 Vol tage,Resistances

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PAGE 6-18 ARVIN

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ARVIN PAGE 6-19

NOBLITT SPARKS INDUSTRIES MODELS 61,62 Schema.tic,Parte



PAGE 6-20 ARVIN

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