vacutrace - vacuum tube curve tracer · vacutrace vacuum tube curve tracer 6 power sets the maximum...

VACUTRACE

Vacuum Tube Curve Tracer

Made in USA

VACUTRACE Vacuum Tube Curve Tracer

2

Copyrights & Trademarks © Copyright Hagerman Audio Labs 2012. All rights reserved. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent.

Disclaimer The information contained in this document is subject to change without notice. Hagerman Audio Labs shall not be liable for errors contained herein or for consequential damages in connection with the furnishing, performance, or use of this material.

Warranty Hagerman Audio Labs warrants this product free of defects in materials and workmanship for a period of 10 years (90 days on tubes). If you discover a defect, Hagerman Audio Labs will, at its option, repair or replace the product at no charge to you provided you return it during the warranty period, transportation charges prepaid to Hagerman Audio Labs. This warranty does not apply if the product has been damaged by negligence, accident, abuse or misuse or misapplication, has been damaged because it has been improperly connected to other equipment or has been modified without the express written permission of Hagerman Audio Labs. This warranty is limited to the replacement or repair of this product and not to damage to equipment of other manufacturers. Any applicable implied warranties, including warranty of merchantability, are limited in duration to a period of the express warranty as provided herein beginning with the original date of purchase and no warranties, whether express or implied shall apply to the product thereafter. Under no circumstances shall Hagerman Audio Labs be liable for any loss, direct, indirect, incidental, special, or consequential damage arising out of or in connection with the use of this product. Hagerman Audio Labs PO Box 61911 Honolulu, HI 96839 808-383-2704 (voice) www.haglabs.com


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Description The VacuTrace is a unique piece of laboratory test equipment that converts your analog oscilloscope into a full-features vacuum tube curve tracer. This powerful and flexible combination accurately sweeps the characteristic curves of diodes, triode, tetrodes, and pentodes in real-time. A special A/B comparison mode allows perfect tube matching by overlapping both sets of curves. A digital readout displays plate and grid bias voltages, cathode current, transconductance gain, and output conductance (1/rp).

Specifications Item Specification Plate Voltage 0V to 380V @200mA Cathode Current 0mA to 100mA (200mA in 2A mode) Grid Step Sizes 0.5V, 1V, 2V, 5V, 10V (8 steps) @5mA Plate Power 20W peak Screen Voltage 100V to 300V @25mA Transconductance 0.1mA/V to 20.0mA/V Output Conductance 0.001mA/V to 2.000mA/V (1000k to 500 ohm) Basic Accuracy 2% voltage and current, 5% conductance Output Signal Gains Plate/Screen: 10mA/V

Grid: -50mV/V Cathode: 40mV/mA

Intensity Modulation 5V TTL levels, low on, high off Heater Supplies 6.3V @5 amp

5.0V @3 amp Socket Adapter Cards Dual Triodes: 8 and 9 pin

Pentodes: 8 pin (A and B) Power: 5V Diodes and 2A3/300B Blank: (wire up you own socket)

Input Voltage 120Vac or 240Vac, 50W Fuse 1 amp 5x20 slo-blo


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Socket Adapter Cards Socket adapter cards are employed to accommodate various tube pinouts. These cards plug onto the connector at the top of VacuTrace and are held in place by four wing nuts. They are built to be rugged and quickly swapped with one another. A socket adapter card must be installed before a vacuum tube can be tested. Standard cards included with VacuTrace are:

• Dual 8 and 9 pin triodes (12AX7A/6DJ8, 6SN7) • Octal pentode power tubes (6L6GC, KT88) • Power triodes and diodes (2A3/300B, 5Y3) • Jumper (any 7, 8, or 9 pin tube)

Connections Connecting a VacuTrace is simple. Use the BNC cables provided to connect the X, Y and Z outputs to your oscilloscope. Note, not all oscilloscopes have intensity modulation. This is ok, but makes it more difficult to determine which curve belongs to which tube in A/B comparison mode.

1. Connect X to channel 2 (horizontal) on your oscilloscope. 2. Connect Y to channel 1 (vertical). 3. Connect Z to the intensity modulation input, usually located on the rear. 4. Connect the ac power cord.

That’s it, install a socket adapter card and you are ready to go. Be sure to set your oscilloscope to XY mode. Also, initially set both channel attenuators to 0.5V/division.


5

Operation

Front Panel The controls have been laid out and spaced for easy and intuitive operation. Be sure to select standby mode before changing tubes or socket adapter cards.

Control/Indicator Description Tube Select Sets the operating mode and chooses which tube to sweep.

There are two tube circuits, A and B, which define the sections within a dual tube (or left and right sockets on the octal power pentode adapter). Stby mode shuts down all signals to the sockets, including heater supplies. Selecting A or B tests just that tube. A/B mode alternately tests both tubes resulting in overlapped curves and is ideal for matching tubes. 2A mode doubles current and power capability by shunting the cathode current sense resistors together.

Grid Steps Selects the step size (gain) for the grid amplifiers. There are always eight steps starting at 0V.

Voltage This is the main limit control and sets the maximum value of plate voltage for sweeping. When the limit is reached, the plate voltage ramps back down to 0V initiating another cycle.

Current Sets the maximum value of cathode current for a sweep.


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Power Sets the maximum peak power dissipated by the tube’s plate during a sweep.

Rate/Offset This is a dual function control. While sweeping it acts as sort of a sweep rate adjustment. It offers a compromise between accuracy and visual flicker. In Hold mode this becomes an offset adjustment for the grid bias voltage.

Sweep/Hold Sets the operating mode between sweeping curves and taking measurements. In Hold mode the 3½ digit LED display is turned on and reads the value of the measurement selected by the Output control.

Output Selects the measurement to be read in the display. Normally, tube curves are swept in the gp mode, but the gm mode can also provide useful information.

Triode/Pentode Operates the tube as either a triode or pentode. The screen is tied directly to the plate in triode mode.

Screen Adjusts the screen voltage when in pentode mode.

Status LED indicates the present operating mode or condition. When in standby it is red. During normal operation it is green. If flashing yellow, then VacuTrace is experiencing an overload condition.

Caution LED lights up yellow when a voltage greater than 70V is present on the output connector.

Rear Panel The rear panel holds the ac mains input/fuse holder connector, on/off power switch, and three output signal BNC connectors. The outputs are labeled X, Y and Z and connect to your oscilloscope by the BNC cables provided. See Chapter 1 for correct wiring.

Socket Adapter Cards Some of the socket adapter cards contain switches. These are for heater voltage selection or, in the case of a diode, to choose which plate is operating (pin 4 or pin 6). The heaters of a 12AX7 type tube are run in parallel at 6.3V (set switch to 12.6V). All heaters are ac. The wing nuts are connected to chassis ground. There are two tube circuits, A and B, which allows for tube matching. The output connector has the following pinout:


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Pin # Signal Description 1 PLATE Plate (common to A and B) 2 3 IKA Cathode (A) 4 GRIDA Grid (A) 5 +6H Switched 6.3V heater power 6 5CT 5V heater center tap, connected to cathode 7 +5H Switched 5V heater power 8 SCREEN Screen (can be switched to plate, common to A and B) 9 10 IKB Cathode (B) 11 GRIDB Grid (B) 12 -6H 6.3V heater return 13 GND 14 -5H 5V heater return On the Duals card, both sockets use A and B circuits (use only one tube at a time). On the Pentodes card, the left socket uses A, right B. Both sockets on the Power card use the A circuit.


8

Generating Curves

Setup The most common use of VacuTrace is to sweep the characteristic curves of a vacuum tube. There are two ways to display curves, cathode current vs. grid voltage, and cathode current vs. plate voltage. Most users are familiar with published operating curves as shown below (which were actually generated using a VacuTrace).

While in standby mode, install your tube. Set the Voltage limit to minimum, the Sweep/Hold switch to sweep, and Output to gp. Adjust the Current and Power limits to appropriate levels. Set the attenuator controls on your oscilloscope to the desired gain levels as given in the following table. Output Oscilloscope Actual Plate/Screen 1V/div

0.5V/div 100V/div 50V/div

Cathode 0.5V/div 0.2V/div 0.1V/div

12.5mA/div 5mA/div 2.5mA/div

Grid 1V/div 0.5V/div 0.2V/div

20V/div 10V/div 4V/div

Make sure the oscilloscope is set to XY mode and the spot is positioned in the lower left corner (you may need to use the horizontal position control instead of the channel 2 offset). This point is defined as 0mA and 0V. Now turn the Tube Select to A and wait 10 to 30 seconds for the heater to warm up. Slowly increase the Voltage limit and you will see curves starting to form. Adjust the Grid Steps and other


9

controls as necessary until you have a full set of curves and the tube is running safely within its ratings.

Limits Three sweep limit controls are provided to prevent tube damage and allow you to adjust the way you want the curves presented. The triode curves shown above are power and voltage limited. The A/B mode curves shown below are both current and voltage limited. Sometimes you will want to combine all three.

Modes Tube matching is accomplished using the A/B mode. VacuTrace automatically alternates sweeps between tube A and tube B displaying both sets of curves simultaneously. Differences in tubes are readily apparent and it becomes obvious that single point matching (such as current at a given bias) is insufficient. The Z-axis intensity control modulates the B tube so that its curves appear dotted. Switching to 2A mode connects both cathode sense resistors together thereby doubling the current capability to 200mA. Note that while in A or 2A mode, the B tube is cutoff by applying –70V to its grid. And, of course, vice versa.


10

Sweep rate is adjusted by the Rate/Offset control. Use this to reduce flicker in the display. Setting the Triode/Pentode control to pentode enables the Screen control. It is best to start at 100V and work your way up. You may switch modes at any time and set controls to any position in any combination without causing damage to VacuTrace.

Transfer Function By switching the Output to gm the oscilloscope display changes to current vs. grid voltage. You will probably have to readjust the attenuator on the X-axis to get a better aspect ratio. This unusual set of curves defines the transfer function for a given plate voltage. However, you must insure that neither the Current nor Power limit controls are involved. Drawing imaginary lines connecting each peak yields the input-to-output transconductance transfer function. Linearity of the tube is demonstrated by the spacing from peak to peak.


11

Measurements

Hold Mode Tube measurements are taken by switching to Hold mode. By doing so, the plate voltage goes to the Voltage limit setting and the grid voltage goes to the Grid Steps setting plus the offset from the Rate/Offset control. This determines the bias point to operate the tube. You will also notice the 3½ digit LED display is enabled. Setting the Output control to Vs reads the present screen voltage, or if set to triode mode, plate voltage. Changing to Vg reads grid voltage. Use the combination of Grid Steps and Rate/Offset controls to obtain any grid voltage from –0.5V to –70V. Once the desired operating point is dialed in, switch Output to Ik to read the resulting cathode current in milliamps.

Ratios VacuTrace provides dynamic ratio measurements of great value to circuit designers, namely transconductance gain and output conductance. Transconductance (gm) mode measures the ratio of output Ik divided by input Vg given in mA/V. The modulation of signals and division is all accomplished with analog circuitry. You can see the modulation on the oscilloscope, centered about the chosen operating point. Similarly, gp measures the output conductance (1/rp) of the tube. It is the ratio of output Ik divided by input Vp given in mA/V. Again, the modulation, or portion of the curve being measured is visible in the display. VacuTrace always provides a clear picture of what is being measured. Other standard tube parameters are calculated by:

p

m

pp

gg

gr

=

=

µ

1


12

Technology

Generating Curves VacuTrace sweeps the characteristic curves of a vacuum tube by applying plate, screen and grid bias voltages and measuring the resulting cathode current. A low value resistor shunts the cathode to ground converting the current into a voltage that is then amplified and sent to the Y channel of the oscilloscope. The plate voltage is ramped up and down and (an attenuated copy) is sent to the X channel, thereby “drawing” a curve on the oscilloscope’s display. The update rate determines image flicker and if fast enough, the curves will appear continuous. A set of curves is formed because the grid voltage changes to a new value every time the plate reaches 0V. The grid is stepped to eight different levels starting at 0V. The oscilloscope photo below shows the relationship between plate and grid voltages.

The peak plate voltage is determined by any of the three limit controls. When one of these limits is reached the ramp is reversed back towards 0V. Normally the voltage limit control sets the peak voltage. But often you may want to limit either peak current or peak plate power, both of which can occur prior to the voltage limit. This capability is to prevent tube damage.

Taking Measurements Both static and dynamic measurements are done in Hold mode. Switching to Hold mode turns off the sweep and sets the plate voltage to the present limit setting (regardless of current and power limits). Static voltages and current are measured using a standard analog-to-digital converter (DMM) IC.


13

In gm (transconductance) mode, a 625Hz modulation is added to the grid output. The dynamic peak-to-peak grid voltage is used as the reference for the LED analog-to-digital converter and the resulting cathode current modulation (just the ac component) is used as the input. This creates an analog divider circuit to calculate ∂Ik/∂Vg, which is transconductance gain. Similarly, in gp mode, the plate voltage is modulated and dynamic cathode current measured to determine output conductance.


14

Miscellaneous

Tube Life Always set the plate voltage limit to minimum before coming out of standby. Do not turn up the plate voltage until the heaters have warmed up, otherwise you could cause cathode-stripping damage. Be careful not to exceed any of the tube’s maximum operating specifications. VacuTrace can deliver a lot of voltage, current and power to a tube. Small signal types such as a 12AX7 are vulnerable to such overdrive. It is not necessary to turn off VacuTrace when swapping tubes or socket adapter cards. That is what standby mode is for. All signals to the output connector are shut off in standby and it is safe to change tubes.


15

Troubleshooting Problem Possible Causes/Solutions Does not turn on. Power cord not plugged in or fuse blown. Power switch

on rear panel must be turned on.

Tries to turn on but does not operate correctly.

AC input voltage selection on wrong setting.

LED display does not work.

VacuTrace must be in Hold mode.

Curves not generated. Faulty tube. Oscilloscope not in XY mode or set up improperly. Heater not warmed up yet. VacuTrace in Stby or Hold modes.

Oscilloscope display is backwards.

XY cables are reversed.

Curves keep disappearing.

VacuTrace is in an overload condition, lower the plate or screen voltage or remove fault.

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This document contains proprietary information and except with written permission

of Hagerman Technology LLC such information shall not be published, or disclosed to

others, or used for any purpose, and the document shall not be copied in whole or in

part. Copyright Hagerman Technology LLC 2000. All rights reserved.

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37H

onol

ulu,

HI 9

6825

58

Mon

day,

Oct

ober

09,

200

0

Titl

e

Siz

eD

ocum

ent N

umbe

rR

ev

Dat

e:S

heet

of

+6V

+6V

-70V

-6V

+6V

+6V

+6V

-6V

+6V

+6V

C32

220p

Q13

2N39

06

Q15

2N39

06

Q19

MJE

340

Q23

MJE

350

D20

1N40

07

Q25

MP

SA

42Q

27

2N39

04

R69

100k

1% R72

200k

1% R75

402k

1% R67

402k

1% R63

60k4

1% R88

100

R93

100

R97

4k7

R77

649k

1%

R81

100

R96

100k

Q21

2N39

06R

92

1k

D15

1N41

48 D

18

1N41

48

R65

200k

1%

D14

1N41

48

R82

2k

R71

10k

U10

A

LM13

700

111

8

75

423

6

D16

1N41

48

R86

71k5

1%

C34

470p

R78

649k

1%

C30

220p

R90

34k0

1% 1/4W

C26

47p

R84

162k

1%

C28

100p

P3

S2A

J3

C33

220p

Q14

2N39

06

Q16

2N39

06

Q20

MJE

340

Q24

MJE

350

D21

1N40

07

Q26

MP

SA

42

R70

100k

1% R74

200k

1% R76

402k

1% R68

402k

1% R64

60k4

1% R89

100

R95

100

R98

4k7

R79

649k

1%

Q22

2N39

06R

94

1k

D17

1N41

48 D

19

1N41

48

R66

200k

1%

R73

10k

U10

B

LM13

700

1116

9

1012

131514

6

R87

71k5

1%

C35

470p

R80

649k

1%

C31

220p

R91

34k0

1% 1/4W

C27

47p

R85

162k

1%

C29

100p

P3

S2B

J3

Q18

MP

SA

92

R83

100

C25

100n

C24

100n

TP

6

TP

7

Q34

2N39

04

R16

3

100k

Q39

MP

SA

92

C51

22p

C52

22p

Q17

MP

SA

92

Q38

MP

SA

92

Grid

A

Grid

2

Grid

1

Grid

0

Grid

3

Rat

e

Hol

d

A/B

Gm

od

IkA

Grid

B

Grid

2

Grid

1

Grid

0

Grid

3

Rat

e

Hol

d

B/A

Gm

od

Shu

tdow

n

IkB

Shu

tdow

n

A A

B B

C C

D D

E E

F F

G G

55

44

33

22

11

200mV/W

VOLTAGE

CURRENT

POWER

SWEEP/HOLD

RATE/OFFSET

CW

CW

CW

CW

R L

1 2 3 4 5 6 7 8 9

123456

0V to 4V

(10)

n/a

A

Va

cuT

rac

e: L

imits

, Osc

illa

tor

Ha

ge

rma

n Te

chn

olo

gy

LLC

P.O

. Box

264

37H

onol

ulu,

HI 9

6825

68

Wed

nesd

ay, S

epte

mbe

r 20

, 200

0

Titl

e

Siz

eD

ocum

ent N

umbe

rR

ev

Dat

e:S

heet

of

+6V

+6V

+6V

+6V

+6V

+6V

+6V

+6V

+6V

+6V

-6V

+6V

+6V

+6V

+6V

-6V

-6V

+6V

+6V

C36

220n

Q28

2N39

04

Q32

2N39

06

LM39

3

U11

B

567

48

R10

3

10k

P4

J4

LM39

3

U11

A

321

48

R10

5

10k

P4

LM39

3

U12

A

321

48

R11

0

10k

P4

J4

Q29

2N39

06

J34

R10

4

10k

P7

S3

P5

J32

R11

9

20k0

1%

R10

0

2k

R99

10k

R11

1

100

R11

7

13k0

1%

R11

6

10k0

1%

R12

0

10k0

1%

R11

5

249k

1% 1/4W

R11

4

249k

1% 1/4W

R10

1

4k7

R10

2

10k

C38

100n

C37

100n

U5A

LM13

700

111

8

75

423

6

Q31

2N39

04

R10

7

10k

R10

6

47k

J4

U13

A

CD

4013

B

D5

CLK

3

S6

R4

Q1

/Q2

V+14 V- 7

Q30

2N39

06

R11

3

1k

R10

8

10k

R10

9

10k

R11

2

1k

U14

A

LM13

700

111

8

75

423

6

U14

B

LM13

700

1116

9

1012

131514

6

LM39

3

U12

B 567

48R

118

10k

C39

100n

R20

0

100k

Sat

urat

e

Vpl

ate

Vca

thod

e

Pla

te

Vca

thod

e

Rat

e

Hol

d

Ram

p

Bot

tom

A A

B B

C C

D D

E E

F F

G G

55

44

33

22

11

50mV/V

40mV/mA

100mA = 2V

TUBE SELECT

TUBE SELECT

ZOUT

5 6STBY

A A/B

B 2A

STBY

A A/B

B 2A

7 81 2 3 4 5 (6)

n/a

A

Va

cuT

rac

e: A

/B, C

ath

od

es

Ha

ge

rma

n Te

chn

olo

gy

LLC

P.O

. Box

264

37H

onol

ulu,

HI 9

6825

78

Wed

nesd

ay, S

epte

mbe

r 20

, 200

0

Titl

e

Siz

eD

ocum

ent N

umbe

rR

ev

Dat

e:S

heet

of

+6V

+6V

+6V

+6V

-6V

+6V

+6V

-6V

+6V

+6V

+6V

+6V

-6V

S4A

D22

1N41

48

P6

J6

J39

S3

Rel

ay

32

4

8 1

5

76

D25

1N41

48

S4B

LM35

8

U16

B

567

48

P6

J6

U15

C

CD

4066

B14

9

7

6 8

D24

1N41

48

D23

1N41

48

R12

2

1k

R12

4

10k

R12

5

10k

R12

6

10k

R12

3

10k

R14

1

20R

03W 1%R

136

20R

03W 1%

R13

8

10k0

1%

R13

7

10k0

1%

R12

8

200k

1% R13

2

200k

1%

R13

4

200k

1%

R13

5

10k0

1% J7P

7

R12

1

10k

U15

D

CD

4066

B14

10

7

12 11

U13

B

CD

4013

B

D9

CLK

11

S8

R10

Q13

/Q12

V+14 V- 7

U15

A

CD

4066

B14

2

7

13 1

U15

B

CD

4066

B14

3

7

5 4

R14

0

10k

R13

9

100

R12

9

10k0

1%

R13

0

100

LM35

8

U16

A

321

48

R13

3

10k

Q33

2N39

04

R16

9

10 1/2W

C53

100n

C54

100n

A/B

Clo

ckA

B

48kH

z

B/A

Sta

ndby

+6H

R

+5H

R

IkB

IkA

Vca

thod

e

A/B

B/A

Grid

A

Grid

B

Vgr

id

+5H

+6H

A/B

B/A

A A

B B

C C

D D

E E

F F

G G

55

44

33

22

11

XOUT

YOUT

OUTPUT

OUTPUT

OUTPUT

1 2 3 4 5 6 7 8 9 10111213

1 2 3 4 5 6 7 1213

Vs

Vs

Vs

Vg

Vg

Vg

Ik

Ik

Ik

gm

gm

gm

gp

gp

gp

OUTPUT

Vg

Ik

gm

gp

14151617

Vs

3 4 1 2

500mV nominal

8 9 1011

141516

18

n/a

A

Va

cuT

rac

e: O

utp

ut, L

EDs

Ha

ge

rma

n Te

chn

olo

gy

LLC

P.O

. Box

264

37H

onol

ulu,

HI 9

6825

88

Mon

day,

Oct

ober

09,

200

0

Titl

e

Siz

eD

ocum

ent N

umbe

rR

ev

Dat

e:S

heet

of

+6V

-6V

+6V

+6V

+6V

+6V

+6V

-6V

R14

6

100k

D28

LED

Yel

low

R14

4

470

S5C

S5B

C45

220n

D30

1N40

07

D32

MS

Q64

10C V4

32

A1

20

B1

19

C1

17

D1

15

E1

14

F1

21

G1

16

P1

18

V3

31

V2

23

V1

22

A2

25

B2

24

C2

12

D2

11

E2

10

F2

27

G2

26

P2

13

A3

29

B3

28

C3

8

D3

6

E3

5

F3

30

G3

7

P3

9

A4

34

B4

33

C4

3

D4

2

E4

1

F4

36

G4

35

P4

4

C40

22u

10V

C46

220n

D27

1N40

07

C41

100p

J10

J8

C43

220n

J1

0

R15

0 100k

J9C

48

22u

10V

D26

1N41

48 D

29

1N41

48

P8

J9J9J1

0S

5A J8

P8

J43

J7

P7

P7

J7J5

2

J10

S5D

R16

1

470

R16

2

470

R16

0

470

J10

J10

J9

J10

J9J9

D31

LED

R/G

J9

R14

3

470

R14

2

470

U17

A

CD

4066

B14

2

7

13 1

C44

220n

U17

B

CD

4066

B14

3

7

5 4

R14

8

47k

U17

C

CD

4066

B14

9

7

6 8

U17

D

CD

4066

B14

10

7

12 11

R15

3

47k

R15

1

100k

R15

9

1k00

1%

R14

5

100k

C47

220n

C49

220n

C42

220n

R15

6

19k1

1%

R15

2

5k90

1%

R15

8

1k00

1%

R15

7

1k00

1% R15

4

1k00

1% J8J8

R14

9

1k00

1% R14

7

11k5

1%

U18

ICL7

107

CA

P+

34

TS

T37

IN-

30

V+1

V- 26

RE

F-

35R

EF

+36

O3

38O

239

O1

40

BU

F28

CO

M32

IN+

31

INT

27

D1

2

AZ

29

CA

P-

33

GN

D 21

C1

3B

14

A1

5

F1

6

G1

7

E1

8

D2

9C

210

B2

11A

212

F2

13E

214

D3

15

B3

16

E3

18

AB

419

PO

L20

G3

22

A3

23

C3

24

G2

25

F3

17

J8J8

R17

0

47k

R17

1

47k

R15

5

9k09

1%

Cau

tion

Gre

en

Vpl

ate

Red

Vgr

id

Vca

thod

eV

grid

Vsc

reen

Vgr

id

Vca

thod

e

/Gm

/Gp

48kH

z

Hol

d

Sin

gle

Diff

Sin

gle

Diff

Vsc

reen

A A

B B

C C

D D

E E

F F

G G

55

44

33

22

11

12V

6V

NC/-6H

IkB

GridB

Plate

-6H/+6H

+6H

IkA

GridA

Plate

Plate

IkB

+6H

-6H

GridA

Plate

IkA

GridB

+5H

-5H

Plate

GridA

Plate

Plate

+5H

-5H

2A3

300B

GridA

Plate

IkA

Screen

+6H

-6H

GridB

Plate

IkB

Screen

+6H

-6H

n/a

A

Va

cuT

rac

e A

da

pte

r: D

uals

, Oc

tals

, Po

we

r

Ha

ge

rma

n Te

chn

olo

gy

LLC

P.O

. Box

264

37H

onol

ulu,

HI 9

6825

99

Frid

ay, A

ugus

t 18,

200

0

Titl

e

Siz

eD

ocum

ent N

umbe

rR

ev

Dat

e:S

heet

of

100

100

100

0R62

1W 0R62

1W

100

6SN

7

1 2 3 4 5 6 7 8

5Y3

1 2 3 4 5 6 7 82A3/

300B

1 2 3 4

100

0R5

5W 0R5

5W

Soc

ket B

oard1 2 3 4 5 6 78 9 10 11 12 13 14

6L61 2 3 4 5 6 7 8

6L61 2 3 4 5 6 7 8

100

100

100

100

12A

X7/

6DJ8

1 2 3 4 5 6 7 8 9

Pla

te

IkB

+6H

-6H

Grid

A

Grid

B

Scr

een

IkA

IkB

Grid

A

+6H

-6H

5CT

Gnd

+5H

-5H

Pla

te

Pla

te

5CT

+5H

-5H

Grid

A

IkA

Grid

B

IkA

Scr

een

IkB

-6H

Grid

A

Grid

B

IkA

+6H

Pla

te

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