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.0:' 4P;(ydwr-ci,d 13FACE JOVANOVICH PUBLICATION

3.01111..

TE6INICIAN/DEALERWORLD SitARGEST TV -RADIO SERVICE & SALES CIRCULATION

- '"'"ta. 44.6!...1; . A...:. "."*. ..

A "; ^),,,,,,-. , . 4,41..... ....f ....t...,t_ 4. - - 7.-...% ^ ..,''14. : ' ' ' ' ' - -.II* b r'q*,I t", ',at:, 4r. ''.. -

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Repairable TV's Are Being Scrappedwith them go servicers prOfrts and customers

FET Fundamentals

Selecting Commercial Audio Amps

9

't

t

,;1- -

.r:1A 01.2 ,9 t4Precision Tuner Service rPt,

edr-tnm, now availanienear"u

ALABAMA:524 32ND STREET SOUTHBIRMINGHAM, ALA. 35222TEL 205. 3232657

TEXAS-EAST:4324.26 TELEPHONE RDHOUSTON. TEX. 77032TEL. 713, 644-6793

TEXAS-NORTH:MOPAC LANELONGVIEW. TEX. 75601TEL. 214, 753-4334

TENNESSEE:3614 LAMAR AVEMEMPHIS, TN. 38118TEL, 901, 365-1918

PENNSYLVANIA-WEST:257 RIVERVIEW AVE. W.PITTSBURGH, PA. 15202TEL 412, 761.7648

PENNSYLVANIA-EAST:1921 5 70th ST.PHILADELPHIA, PA. 19142TEL. 215, 724-0999

OREGON:5220 N E SANDY BLVDPORTLAND, OREGON 97213TEL 503, 2821636

CALIFORNIA-NORTH:4611 AUBURN BLVD.SACRAMENTO, CALIF. 95841TEL 916, 482.6220

CALIFORNIA-SOUTH:5111 UNIVERSITY AVE.SAN DIEGO, CALIF. 92105TEL. 714, 280.7070

COLORADO:4958 ALLISON STARVADA, COLO. 8001TEL 303, 423.7080

FLORIDA-NORTH:1918 BLANDING BLVDJACKSONVILLE, FLA. :32210TEL 904. 3891952

... new pts products ... stop ... new 1974-1975 tuner replacement guide andparts catalog no. 4 ... stop ... 96 pagesof top tuner information ... stop ...

. . blow-ups of all types of vhf and uhftuners for easy parts identification .... .. stop ... largest exact tuner replace-ment guide available in the industry... stop ... antenna coil replacement

guide ... stop ... multifit replacementtuner shaft guide ... stop ...

available for $2.00 ... stop ...... redeemable with min.

order ... stop ...pts elex .

OKLAHOMA:3007 N. MAYOKLAHOMA CITY, OKLA. 73106TEL. 405, 9472013

OHIO-SOUTH:US TUNER SERVICE8180 VINE STCINCINNATI, OHIO 45215TEL 513, 821-2298

OHIO-NORTH:5682 STATE RD.CLEVELAND, OHIO 44134TEL. 216, 845-4480

FLORIDA-SOUTH:12934 N.W 7th AVEMIAMI, FLA. 33168TEL. 305. 6819811

rr

9.4/41,

.412

NORTH CAROLINA:724 SIEGLE AVE.CHARLOTTE, N.C. 28205TEL. 704, 332.8007

N.Y. CITY-NEW JERSEY:158 MARKET ST.E PATERSON, N.J. 07407

TEL 201, 7916380

HOME OFFICE-INDIANA:5233 S. HWY. 37BLOOMINGTON, IND. 47401TEL. 812, 824.9331

9FW YORK.993 SYCAMORE ST.BUFFALO, N.Y. 14212TEL. 716, 891-4935

KANSAS:3116 MERRIAM LNEKANSAS CITY. KANSAS 66100TEL 913, 8311222

LOUISIANA:.'914 WYTCHWOOD DR%.ETAIRIE, LOUISIANA 70'IL 504, 885.2349

MARYLAND:1105 SPRING ST.SILVER SPRING. MO. 20'TEL. 301, 5650025

MASSACHUSETTS:191 CHESTNUT ST.SPRINGFIELD, MASS. 01103TEL 413, 734.2737

MICHIGAN:13709 WEST 8 MILE RDDETROIT, MI. 48235TEL. 313, 8621783

MINNESOTA:815 WEST LAKE ST.MINNEAPOLIS, MINN. 55408TEL 612, 824.2333

MISSOURI:8456 PAGE BLVDST. LOUIS, MO. 63130TEL. 314, 4281299

LET US TAKE CARE OF YOUR TUNER PROBLEMS...PTS will repair any tuner-no matter how old or new-black & white or color-transistor or tubes--varactor or electronically tuned-detent UHF. 8 hour service is a must!

Tast 8 hr. Service!We offer you finer, taste

-ti

...THIS IS THE SERVICE WE OFFER:1. Fastest Service -8 hour-in and out the same day. Overnight transit to one of our

strategically located plants.2. Best Quality- Your customers are satisfied and you are not bothered with returning

tuners for rework.3. PTS uses only ORIGINAL PARTS! No homemade or make -do, inferior merchandise (this

is why we charge for major parts!). You get your tuner back in ORIGINAL EQUIPMENTcondition.

4. PTS is recommended by more TV Manufacturers than any other tuner company.- 5. PTS is overhauling more tuners than all other tuner services combined.

Tuner Service

1 YEAR GUARANTEE

ELECTRONICS, INC.......Number ONE and still trying harder!

(Not a Franchise Company)

VHF, UHF $10.95UV -COMBO 17.95IF-SUBCHASSIS 12.50

Major parts and shippingcharged at cost.

(Dealer net!)Over 4000 exact tuner replace-ments available for $14.95 up

(new or rebuilt)

. . for more details circle 127 on Reader Service Card

27 INDISPUTABLE REASONS FOR USINGDATA TECHNOLOGY'S HANDHELD DIGITALMULTIMETER- FREE FOR nvo WEEKS.

1. FREE TRIAL OFFERData Technology's Model 21 is unique.There's no question about it: a palm -sized31/2 digit DMM that measures capacitancealong with AC and DC volts and resistance.Send for the Model 21 now and use it dailyin the field or at your bench. Corry it around,knock it around, use it hard, work it long,and if at the end of two weeks you don'tthink it's worth the $269.00 we're asking,send it back. And you won't spend o dime.

2 DELIVERY WITHIN 14 DAYSWe understand. Once you've decided youwant on instrument, especially a piece ofequipment as new and exciting as the Model 21, you don'twont to have to go through the old, tedious, inquiry run-around. Moil in the coupon. Before fourteen days have passed,you'll be using your Model 21.

3. SMALL LIGHTWEIGHT PORTABILITY FORHANDHELD OPERATION

What do you need in a portable DMM? How about a palm -sized unit that fits comfortably in your hand? We've fit all of therange and function features you wonted into a package thatslips into o pocket. Only12 ounces in a case 6.80 inches by3.25 inches by1.75 inches.

4. UNIQUE CAPACITANCE READINGSData Technology's Model 21 is the first, andonly, handheld digital multimeter to givethe capability of measuring capacitance,along with AC and DC volts and resistance.Two meter capability for the price of one.

Model 21 Only hondheld porroble DMM to measure copocoonce

5. MOMENTARY ORCONTINUOUS ACTION

Battery charge life is conservedby push -to -read switches on -hecase side and optional push--o-

read probe. For a hands off "ON" state, slide the push-to-reodswitch into its "locked -on" position.

6.0.270 INCH LED READOUTImmediately and easily visiblewhatever the light conditions,not like reflective liquid crystals,or small LEDs. In a digitalmultimeter, what could be more important than an easy -to -read display?

7.3%2 DIGITS FOR FULL 2000 COUNT

8. FLASHES OVER RANGEThe last three digits flash automatically when you are out ofrange. No reading errors due to the wrong range.

9. IMPACT RESISTANTRugged construction, inside and out, absorbs physical shock.It'll get dropped. And banged. But, any*ime, anywhere yourwork requires, it'll keep working.

11. USE YOURCREDIT CARD

OR P O. NUMBERJust fill in Bank-Americard, Master -Charge or P.O.number, and giveus your signatureauthorizing charge.In 15 days, whenyou're a happyman, we'll submit

10. ACCURACYHere ore accuracy comparisons betweenthe Model 21 and its volts and ohms com-petitors, the HP 970A and the Danameter.We offer this comparison because weknow variety of function and range isimportant, but accuracy is crucial. Thereore four Model 21 ranges for each func-tion. DC voltage: 2V, 20V, 200V, ond1,000V. AC voltage: 2V, 20V, 200V, andup to 1,000 peak. Resistance: 2K ,20K ft , 2001Q/ , 2,000K 1) . Capacitance:2nFd (2,000pFd), 20nFd, 200nFd, and2,000nFd (2µFd).

FOUR DC VOLTAGE RANGES

FOUR AC VOLTAGE RANGES

FOUR RESISTANCE RANGES

FOUR CAPACITANCE RANGES

on invoice. Or youcon include a check or money order with your order.

12. $525 SPECIAL DEAL (SEE COUPON)

13. JUST FILL IN SELF MAILER BELOWPick up a pen or pencil and get started, so that we can sendyou a Mocel 21. But, if you're still not convinced, our strongestkickers ore yet to come.

Nome

Company

Address

City Store Zip

El Send a Dora Technology Model 21 for $269! If I am not completely sotisfied. I mayreturn the Model 21 within 15 days and owe nothing.Recharger: 0 100V 0 115V

0 Two of us would like ro order Model 21s. so pass theth2e30soVvings on.Twc Model 21's for$525: save $13.00. That's special.

I'd like the push -to -read option for $100 I'll take a high voltage probe for $15. Doto Technology's product line sound:. nteresting. Send me additional literature on

these product lines0 DonkAmericard 0 P O.

Your credit card or P 0 Number (IncludeI prefer to be billed:

four digit bank number if mosterchorge)

Signature (please sign here)local tuxes. if or. be added

IE1 data technology corporation

14. SPECIFICATIONS COMPARABILITYOkay, for all of you who hove been saying, "Enough words,show me the facts:' Here they ore.

DC VOLTS mODF t 11

AC VOLTS

ON/AS

;'APAC

HP 9/0A DANA 200C

15. FLIP -UP STAND

16. BATTERY OPERATEDWhen operated in push -to -readmode, the internal NiCadbatteries provide typicallymore than 2,000 readingsfrom the rechargeable battery pock.

17. SELF -CHARGINGThe internal battery pock recharges overnight. Please specify100, 115, or 230 volts when ordering your Model 21.

18. HANDY BELT CARRYING CASEIncluded os standard equipment.

19. CONSTRUCTED FOR FIELD CONDITIONSOut in the field there's nothing to worry about; it's constructedfor the toughest conditions. Yes, Data Technology's Model 21had to be small, portable and multi -talented. But, what goodwould all that be if it was temperamental?

20. SOLID STATE SINGLEBOARD, STANDARD

COMPONENTS DESIGNInside the high impact polycarbonatecase, the Model 21 uses a single PCboard that performs to your highestexpectations with the fewest com-ponents. All components laid downto withstand impact. shock and abuse.

21. FIVE STEP SIMPLIFIEDCALIBRATION

Only 1 adjustment for each function,plus a zero adjustment. It's less thana 15 minute job, first time.

22. HIGH VOLTAGE PROBE OPTIONIf you take high voltage readings, an extra $15 willextend your Model 21 voltage measurementcapabilities to 30,000 volts.

23. PUSH -TO -READ PROBEFor an extra $10,we'll include a push -to -read probe. Standard test leads oreprovided free.

24. BUILT BY DATA TECHNOLOGY CORP

25. 1 -YEAR FACTORY REPAIRData Technology Corporation warrants that every Model 21Digital Multimeter meets its published specifications before it isshipped from the factory. The Model 21 is warranted againstdefects in mateiols and workmanship for a period of one (1)year from the date of delivery.

26. COST: LOW PRICE FOR PERFORMANCEWe can't help repeating ourselves: at $269.00 it's like receivingtwo digital meters for the price of one. You get AC and DC voltsand resistance measurement, just like our competitors offer,plus capacitance measurement. At a great price: $269.00.

27. READY TO MAIL WON'T COST YOU A STAMPBy now, you've filled your order coupon on theother side of this page. Okay. See the self -moilerbelow? Tear out this sheet on the perforations,

and fold it into thirds with address onthe outside. Staple it. If you've included

a check or money order, also staple bothends. Drop this moiler in the mail box. Now

wait.You'll be receiving your Model 21 within14 days.

Business Reply Moil

No postage stamp necessary if moiled in the United States

Data Technology Corporation

2700 Fairview Rood

Santo Ana, Colifornio 92704

FIRST CLASS

PERMIT NO. 4314

SANTA ANA, CA. 92704

J. W. PHIPPSEditor1 East First StreetDuluth, Minn. 55802(218) 727-8511

ALFRED A. MENEGUSPublisher757 Third AvenueNew York, N.Y. 10017(212) 572-4839

TOM GRENEYPublishing Director

JOSEPH ZAUHARManaging Editor

DEBRA BOOTHProduction Manager

JOHN PASZAKGraphic Design

LILLIE PEARSONCirculation Fulfillment

GENE BAILEYManager, Reader Services

MANAGERS

DAVE HAGELIN43 East Ohio StreetChicago, III. 60611(312) 467-0670

CHUCK CUMMINGSAd Space South/West613 North O'ConnorIrving, Texas 75060(214) 253-8678

KEN JORDANDONALD D. HOUSTON1901 West 8th StreetLos Angeles, Calif. 90057(213) 483-8530

CHARLES S. HARRISONCY JOBSON57 Post StreetSan Francisco, Calif. 94104(415) 392-6794

ROBERT UPTONTokyo, JapanC.P.O., Box 1717

Circle 106

ELECTRONICTECHNICIAN/DEALERAUGUST 1974 VOLUME 96 NUMBER 3

FEATURES

15 SONY'S WIDE-ANGLE TRINITRON COLOR TV

A new 114 -degree Trinitron color CRT, a gate -controlled switch (GCS) in the horizon-tal -output stage and a switching type low -voltage regulator system, which uses an-other GCS, are some of the new features and circuitry in Sony's 17 -inch KV-1722color chassis. By G. P. McGinty.

24 REPLACEMENT COLOR PICTURE TUBES-Propping up Servicers' Profits

Income from the sale and installation of replacement pic:ure tubes can offset de-creases in servicer/dealers' incomes from sources which ale being changed by tech-nology, economics and marketing trends. By Richard Deutsch, Vice President, PictureTube Operations, Channel Master Division, Avnet, Inc. (Cover photo courtesy ofChannel Master.)

26 EFFECTIVE ADVERTISING FOR THE SERVICE DEALER

A recognized authority reveals five Noven tricks cf the trade which will increasethe effectiveness of your advertising. By William Walker, vice President & Manage-ment Supervisor, Cunningham & Walsh, Inc.

28 MODERN SERVICING TECHNIQUES-Field-Effect Transistor Fundamentals

A servicer-orie itec, explanation of basic FET theory. JFET's and MOSFET's. By B. B.Dee.

34 SELECTING COMMERCIAL AUDIO AMPLIFIERS

A review of fundamental, but important, factors pu must consider to select thecorrect amplifier for a particular application. By Jack Hobbs.

TEKFAX-Admiral Ch. M24, Airline Model GAI-17025A, General Electric Ch. R-2,Philco-Ford Ch. 3CS45 and Zenith Ch. 19FB12, 13.

DEPARTMENTS6 READER'S AID

10 TECHNICAL DIGEST

11 TECHNICAL LITERATURE

12 NEWS OF THE INDUSTRY

13 ELECTRONIC ASSOCIATION DIGEST

38 COLORFAX

42 NEW PRODJCTS

49 DEALER SHOWCASE

54 ADVERTISER'S INDEX

55 READER SERVICE

L ' A HARCOURT BRACE JOVANOVICH PUBLICATION ARP GOHARCOURT BRACE JOVANOVICH PUBLICATIONS: James Milholland, Jr., Chairman; Robert L. Edgell,President; Lars Fladmark, Senior Vice President; Richard Moeller, Treasurer; John G. Reynolds,Vice President; Thomas Greney, Vice President; Ezra Pincus, Vise President; Bruce B. Howat, VicePresident; James Gherna, Vice President.

ELECTRONIC TECHNICIAN/DEALER is published monthly by Harcourt Brace Jovanovich Publications.Corporate Offices: 757 Third Avenue, New York, New York 13017. Advertising Offices: 43 EastOhio Street, Chicago, Illinois 60611 and 757 Third Avenue, New York, New York 10017. Editorial,Accounting, Ad Production and Circulation Offices: 1 East First Street Duluth, Minnesota 55802.Subscription rates: One year $6, two years $10, three years $13, in the United States and Canada.Other countries: one year $15, two years $24, three years $30. Single copies: 75C in the U.S.and Canada; all other countries $2. Second c ass postage paid at Duluth, Minnesota 55806 andat additional mailing offices. Copyright 1974 by Harcourt Brace lovanovich, Inc. All rightsreserved. No part of this publication may be reproduced or transmitted in any form or by anymeans, electronic or mechanical, including photocopy, recordirg, or any information storage andretrieval system, without permission in writing from the publisher.POSTMASTER: Send form 3579 to ELECTRONIC TECHNICIAN/DEALER. P.O. Box 6016, Duluth,Minnesota 55806.

AUGUST 1974, ELECTRONIC TECHNICIAN/DEALER 5

Our little "3-incher"is bigger thananybody's!

L.80-3023" DUAL TRACE/DUAL CHANNELTRIGGERED SCOPE

Conquer the test bench squeeze! Obtain lab -grade quality! Here's solid state accuracy pluspush-button convenience for trig. & auto. sweep& "free run" momentary function. 10MHzb'width 10mVp-p/div to SVp-p/div Vert. Seri -

LEADER

4.011COrt

S699.11

With accessories

sitivity, 9 steps. Sep. or simult. sweep display,ch 1 & 2 alt., chopped, algebra added and 74-4vector. Sweep range from 1p s/div sw./5X mag) to 0.2s/div, 17 steps. Polarity in-version on ch 2. 43/4"H, 10 lbs.

"Put us to the test"INSTRUMENTS CORP. 151 Dupont St., Plainview, L.I., N.Y. 11803 (516) 822.9300

. . for more details circle 123 on Reader Service Card

atalog of

BUSINESSFOR

for TV and appliancedealers

Featuring ... SERVICEORDERS

SALES SLIPS

STATEMENTOSPURCHASE

RDERS, ETC.

... printed on NCRProvides clean,

clear copieswithout

carbons-nothingto insert, tear out

or throw away.

. LOWPRICES ... 6 DAY

SERVICE

..:5111b4EY-BACK44JARANT

T.M. of National CashRegister Co.

A reg.

------- _____________________to. New England Business

Service, Inc.,P.O. Box 500, Townsend,

Mail

Ma. 01469

Yes, pleasemail me your

FREE catalogof business torms.

Name

Street8

City, State. ZiP ETD -8 1''.......114. -I

. . . for more details circle 125 on Reader Service Card

6 ELECTRONIC TECHNICIAN/DEALER, AUGUST 1974

READERS' AID

Space contributed to help serve thepersonal needs of you, our readers.

Business for SaleAfter 20 years, I would like to re-

tire from established Radio/TV Salesand Service business. Good franchise.Located in fast-growing town and rea-sonably priced. Please write for de-tails.TIRSHMANS TVBox 1153, Sta. A.Surrey, B.C., Canada

Established radio/TV sales andservice in business for 22 years. Wellequipped and stocked. Excellent op-portunity and priced right. Located inwestern Pennsylvania.TED'S TELEVISION516 Fifth AvenueFreedom, Pa. 15042

TV Service Business for sale. Oneor two man established electronic ser-vice shop, near downtown Provo,Utah. Please write for details.GORDON E. SIMKINP.O. Box AProvo, Utah 84601

SwapI have a B & K 1077B television

Analyst that I would like to trade fora new or used AM/SSB CB radio,preferably new. I will consider Hamequipment.BERNARD R. EGER1958 Comm Sq (AFCS)PSC # 1, Box 1762A.P.O. San Francisco, Cal. 96334

WantedPower transformer for a Courier

Royale FM Transmitter/ Receiver.Serial No. 316299.C. U. COBERLEYTrenton Radio & TV502 W. 13th St.Trenton, Mo. 64683

Jackson Capacitor Checker, Model650A or newer.LEON A RENDS102 N. WebsterShenandoah, Iowa 51601

Substitute for a Knight Kit AM/ FMIF Transformer, Part No. 113216,used in a Model KF-90 (83Y914)Stereo Multiplex FM/AM Tuner.HOWARD C. HACKMAN50 Township RoadDundalk, Md. 21222

Vertical -output choke for G.E.black and white TV, Model TR805,Part No. ET63X66.ZEPHYR ELECTRONICSJim 0. Coleman723 5th AvenueZephyrhills, Fla. 33599

Accurate Receiving and PictureTube Tester, Model 42. Also, Mer-cury Model 1900, Color -Bar Genera-tor or other brands. Please state prices.R. STANTON428 W.Roosevelt Blvd.Philadelphia, Pa. 19120

Schematic for a Federal Model 610Portable Radio. (Federal TransistorCo., Inc.)SAM YUPPA16191 Melody LaneHuntington Beach, Ca. 92649

Schematic or owners manual for aBSR McDonald 5500 (Decormatic),Serial No. 2033, Model No. 500/X-PB-5.HOWARD TOLLETTP.O. Box 1072Clovis, New Mex. 88101

Owners manual and related materialfor a Lafayette Comstat 19 CB Radio.RANDY MAURER463 Pelham RoadNew Rochelle, N.Y. 10805

Audio -output transformer for Web-cor Tape Recorder Model 210.REV. H. P. BARRETT2025 W. CoronadoOrange, Tex. 77630

For SaleSylvania Model 500 TV Sweep Gen-

erator and Sylvania Model 501 TVMarker Generator. In original cartons.CERTIFIED RADIO -TV LABORATORIES5519 New Utrecht Ave.Brooklyn 19, N.Y. 11219

Jerrold Model 601 Sweep Genera-tor. Good condition, calibrated.G. BRONNER2 Crabapple DriveLawrence Twp., N.J. 08638

Early RCA Service Manuals, 1923through 1948 and Rider Manuals,Volumes 1 through 21 in good condi-tion. Best offer.MAURER RADIO -TELEVISION SERVICE29 S. 4th StreetLebanon, Pa. 17042

ARE YOURKIDS WATCHINGOFF-COLOR TV?

THEN CALL YOUR NEIGHBORHOODTV TECHNICIAN.

When MarshalDillon's horse starts turning

green on your color TV set,

don't wait untilyou've got really big headaches.

Early attention pre-

vents related problems andmakes it easier . and

less expensive ...

to find and cure thetrouble. Call your independent

TV -radio service

technician when color troublestarts.

THIS MESSAGEWAS PREPARED BY

SPRAGUE PRODUCTSCOMPANY.

IlsFRIFOOPF, F.PPIPPGOI f ,Nr r

tonPON ADAMS PFASSPCMUSf11S FOP

YOUR INDEPENDENTTV -RADIO SERVICE

DEALER

PUT THISBUSINESS -BUILDINGTRAFFIC -STOPPER

ON YOUR SHOP WALLOR IN YOUR WINDOW

See your Sprague Distributor for window -size blow-upsof this message. Or, send 250 to Sprague Products Co.,65 Marshall St., North Adams, Mass. 01247 to coverhandling and mailing costs. Justask for Poster RP -41.

THE BROAD-UNE PRODUCER OF ELECTRONIC PARTS

SPRAGUETHE MARK OF RELIABILITY

for more details circle 133 on Reader Service Card

AUGUST 1974, ELECTRONIC TECHNICIAN/DEALER 7

RCA%

Fite& 1Dealer Awards

ElectronicComponents Harrison, New Jersey 07029

Toastmaster Plug-in AutomaticTimer for Lamps and AppliancesCordless timer plugs directly into outlet. Timecycle extends from 90 minutes to 221/2 hours.Turns lamps and appliances on or oft anytime of day or night and repeats the operationevery 24 hours without resetting.FE -630

Polaroid Colorpack 5 Land Cameraand Kit. Enjoy Instant Photographyin Color and Black and White Big 31/2 x 41/2 color pictures in one minute Blackand white pictures in seconds 3 -element leis andunique face -in -the -square viewfinderFE -687 Value: $44.95

Schick Styling Driers, Man Lady's ModelsFor Women: Quick drying with more natural stylingFor Men: Dries fast while it styles and grooms 2 Speeds, 2 Heats Dry setting - high airflow and high heat Stylesetting - low airflow and low heat Professional styling brush and stylingcomb Air concentrator nozzle

Canon Palmtronic LE -83 CalculatorSlender enough to put in your pocket, the CanonPalmtronic LE -83 combines convenience with preci-sion. Adds, subtracts, multiplies, divides, performsmixed calculations, calculations with a constant andn-th power calculations. Comes with an AC adapteror can be used with 4 penlight batteries. Smoothkey touch, easy to read LED indication panel.FE -LE -83 Value: $44.95

Spalding "Rebel" Golf Balls(One Dozen)Spalding is the premier distance ballwith indestructible Surlyn cover. Two-piece construction gives you extrayards for the power you pack into yourdrive.

Spalding "Collegiate" FootballThe best value you'll find in a full -grain leather football. Tough butylrubber bladder. Triple fabric liningwith lockstitch construction.

When you buy RCA tubes from your participating RCA tube dis-tributor, he delivers the goods the easy way. No muss, no fuss,no constant cutting of carton flaps, no torn cartons on your shelfor in your caddy. Just give your tube order to your RCA distributorand get your premium the free and easy way. The bigger yourtube order, the more valuable your gift. So visit him soon andselect your Free and Easy RCA award with you- purchase of RCAtl ibps (The values am really extra snecial.)

No Muss No Fuss No Torn Tube Cartons.Visit Your Participating RCA Tube Distributor.Place Your RCA Tube Orderand Select Your "Free and Easy" RCA Award!

Remember, the Award Values Are Extra Special!

Omaha Steaks Ten RCA "Steak -out '74" certifi-cates can be redeemed for one package of tender,succulent Omaha steaks as follows:6 (11 oz.) Boneless Strip Sirloins 1!/8" thick or8 ( 6 oz.) Filet Mignons 11/4" thick or8 ( 8 oz.) Top Sirloins 11/41" thick or6 ( 8 oz.) Filets of Prime Rib 1" thickChoice cuts, generous portions and outstandingflavor! 1A2116

Compass BinocularsPerfect for use at the track, at the stadium, in thewoods. Field of view is a large 367 Feet at 1000yards. Hard -coated optics. Complete with caseand strap.FE -3022 Value: $44.95

BULOVA The watch you wear with pride. Buloka ... synonymous with quality, craftsman-ship, precision and style.Oceanographer - Highly contemporary 17 jewel, See King - Stalwart Bulova Sea King, 17 jewelautomatic instant change day/date calendar; precision timepiece, water-resistant with luminousdepth tested to 333 feet. FE -12604 Value: $110 dial. FE -12280 Value: $65La Petite- Stunning feminine timepiece with 23 Ccncerto - Prettily sculptured model with 17 jew-Jewels, 4 diamonds, 10K rolled gold plate case els, 10K rolled gold plate, stainless steel back andAdjustable mesh bracelet. FE -55775 Value: $110 silver dial FE -63628 Value: $65

Shakespeare De tixe SpinningCombo Balanced Tackle SetShakespeare #2210 Marina Green spinning reel,matching Shakespeare SP -160 6' 6" Wonderod,200 yards 6 -pound monofilament, box of stainlesssteel hooks and spinning lure. For fresh and lightsalt -water fishing. FE -S460 Value: $42.00

Spalding Pancho Gonzales"Pro Champ" Tennis SetPancho Gonzales "Pro Champ" racket, water-proof racket cover, plus three Pancho Gonzalestennis bals.FE -531033 Value: $18.65

TECHNICAL DIGEST

The material used in this section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.

ADMIRALTape Player Chassis 8Y6-Motor Failure

Admiral console stereo Models KS821, KS823, KS828,KS833 and KS843M were produced with alternate 8 -tracktape player chassis 8Y6 instead of the specified 8G6A. Thechassis number is stamped on the player chassis.

If you encounter any 8Y6 tape players with motor fail-ure caused by the motor fan rubbing or stalling on the bot-tom motor bracket, replace the motor with the 700A858-516 motor, which has been modified to prevent this typeof failure.

MAGNAVOXNew "CE" Color TV Models-Modifications

Last year, the 10 -digit, alpha -numeric model numberingsystem was put into effect. Models introduced in 1973 wereidentified by the letter "D" in the model number, such asthe color TV model CD4730WA1 1. Since the first of thisyear, several models have been shipped with the secondletter updated to "E," such as CE4731WA 11, to indicate1974 model introductions. Certain color TV models whichuse the T989 chassis and carry the "E" designation havebeen modified in the following ways:

First, the wiring for the AFT switch has been altered toenhance the benefits provided by the Videomatic feature.Formerly, the AFT circuit could be switched on or off onlywhen the VIDEOMATIC button was in the on position. WithVideomatic off, the AFT circuit was inoperative. Thisswitching action has been reversed in the "CE" models sothat AFT is always on when Videomatic is on, regardlessof the AFT switch position. When Videomatic is off, theAFT circuit may be turned on or off as desired. The AFTswitch is located on the front panel of "E" models and onthe secondary control (rear) panel of "D" models.

A second change concerns the HIGH BRIGHTNESS ADJUST(on the rear apron of the chassis), which has been deletedin the "CE" models. One PRESET BRIGHTNESS control hasbeen retained for Videomatic set up, and is positioned be-hind the customer -operated BRIGHTNESS control. This pre-set control should be adjusted for the desired brightnesslevel with the VIDEOMATIC switch in the on position andwith the customer BRIGHTNESS control set at the 12 o'clockposition.

Also, a PRESET CONTRAST control has been mounted be-hind the main CONTRAST control. Similar to the other presetadjustments, the PRESET CONTRAST control is adjustedthrough the hollow shaft of the customer -operated CON-TRAST control, and it is set for the desired contrast levelwith the VIDEOMATIC switch in the on position and the cus-tomer CONTRAST control set at the 12 o'clock position.Stereo theatre models which use the 704078 remote con-trol do not have the PRESET CONTRAST control, because thePRESET COLOR control occupies this position.

Color TV Chassis T989-Digital Channel -Indicator Dimmer Ci1cuit

Color TV models which use the T989 chassis and the704084-1 Six -Function Remote Control system have adimming circuit to control the brilliance of the channel -in-dicator lamps. In normal operation, the proper combinationof lamps is switched in for each position of the channel -selector knob to indicate the channel number. When a

channel is first switched in, the selected channel -indicatorlamps glow at maximum brilliance for several seconds. Atthe end of this time, a dimmer circuit switches the lamps toa half -power condition so that the channel number becomesless noticeable during normal viewing.

There have been cases reported where the lamps remainat full brilliance all of the time. In each instance, the prob-lem was traced to a shorted or leaky diode, D20, on the Re-mote Receiver module. The diode is made of germanium,rather than silicon, and this fact is important to the correctoperation of the remote system. Should diode D20 requirereplacement, be sure to use the correct replacement-PartNo. 530092-1001.

RCA CORPORATION"Triple -Branded" 6M16/61.Q6/61E6C Horizontal Deflection Tube

The new RCA 6MJ6, which has been triple -branded toinclude 6LQ6 and 6JE6C, is a double -ended, high-perve-ance, beam power tube of the novar type with a T-12 en-velope. This tube type is specifically designed to be an ultra -reliable field replacement for the older 6LQ6 and 6JE6Ctubes in horizontal deflection amplifier service in color TVreceivers.

This new horizontal -output tube has an integral envelopetop -cap assembly which eliminates loose top -caps and mini-mizes glass dome failures.

The design also assures reduced microphonics and im-proves the ability to withstand shock and vibration. Otherimprovements allow this type to endure the excessive platedissipation encountered during receiver fault conditions.Control testing assures that the tube can withstand a 200-wplate dissipation for a continuous or accumulated exposuretime not exceeding 40 seconds, which should be sufficienttime to permit conventional receiver protection devices tofunction.

The sharp high -voltage cutoff characteristic and the hightransconductance (gm) of the tube assure low retrace con-duction levels even in TV receivers with reduced drive volt-age.

A plate connector cools the plate by conduction, result-ing in lower plate operating temperatures and longer life.The special plate structure is designed to minimize second-ary -electron emission from the plate and "knee" discon-tinuities in the zero -bias region of the Eh - II% character-istic. A separate base -pin connection to grid No. 3 is pro-vided so that positive voltage can be applied to grid No. 3to minimize interference from "snivets" and to increasepower output.

voCTORrCO

(

"Electronic discoveries are being made daily so I don't want to make adefinite diagnosis until I've consulted other specialists."

10 I ELECTRONIC TECHNICIAN/DEALER, AUGUST 1974

TECHNICALLITERATURE

SpeakersA 2 -page, two-color data sheet de-

scribes the company's MagneplanarTympani line of loudspeakers. It de-scribes five different speaker modelsand includes detailed specifications onperformance as well as physical fac-tors. Audio Research Corp., 2843 -26thAvenue South, Minneapolis, Minn.55406.

Industrial SCR'sA brochure describing SCR's Triacs

and Ignistors designed for industrialequipment is now available. Includedare products suitable for power con-trollers, inverters, induction heating,radar pulse modulators and high -power welding. Bert Green, ProductManager, Power Tubes and Devices,Amperex Electronic Corp., Hicksville,N.Y. 11802.

Industrial Tubes andSemi -Conductors

A 48 -page wholesale industrial typeelectron tube and semiconductor direc-

entertainment, industrial, power con-ductors, such as diodes, transistors,SCR's, FET's and integrated circuits.Communications, Inc., 2115 AvenueX, Brooklyn, N.Y. 11235.

Voltage Regulator DiodesAn 8 -page, short -form catalog of

voltage regulator diodes is now avail-able. The catalog provides technicaldata on more than 100 types of zenerdiodes, reference diodes, and stabistorsavailable from Amperex. Included inthe catalog are charts showing tem-perature coefficients and derating fac-tors, noise generation, and stabistorconductance characteristics. AmperexElectronics Corp., Solid State and Ac-tive Devices Division, Slatersville,Rhode Island 02876.

Sound EquipmentA 124 -page catalog of sound equip-

ment and accessories describes in de-tail the product lines of 48 leadingmanufacturers. The publication is il-lustrated throughout, and products areindexed by both category and manu-facturer. Net prices are provided,completely up-to-date and current asof press time. Sound Foyer, 1521South Hill St., Los Angeles, Calif.90015.

DC to10 MHz,10 mV/cmsensitivity5" CRT

Model 4555" SCOPE$310

dB

1111111111111/M

11111.111111111-1111111111111111

-10

-20

Direct input for vector display Sensitivity: vertical, 10 mV/cm

to 5 V/cm; horizontal,300 mV/cm.

9 -step calibrated andcompensated verticalattenuator

Accepts standard scopecameras and viewing hoods

Low -parallax, high -contrast,calibrated graticule

1 kHz square wave calibrationsignal

(INSTRUMENTS INA STAY CCU.AT.

430

-20

-ID

d:

High linearity sweep withretrace blanking-separate7875 Hz position for TV work

120 or 240 VAC operation,50 or 60 Hz

Fold -in support for inclineviewing

Size 103/8" H x 8" W x 16'/2" D Low -capacitance 10:1 probe

available

SEE YOUR ELECTRONICSDISTRIBUTOR OR WRITE FORCATALOG 4300

SIMPSON ELECTRIC CO.853 Dundee Avenue, Elgin, Illinois 60120(312) 695-1121 CABLE: SIMELCO TELEX: 72-2416IN CANADA: Bach -Simpson, Ltd., London, OntarioIN ENGLAND: Bach -Simpson (U.K.) Limited, Wadebridge, CornwallIN INDIA: Ruttonsha-Simpson Private, Ltd., Vikhroli, Bombay

KATY INDUSTRIES

EICTINCAL EQUIPMENTGROUP

... for more details circle 132 on Reader Service CardAUGUST 1974, ELECTRONIC TECHNICIAN/DEALER 111

NEWS OF THE INDUSTRY

PTS Electronics Opens Three New Tuner Service Centers

PTS Electronics, Inc., an Indiana -based tuner repair company, has announced theopening of three new service centers, in Miami, Florida (12934 N.W. 7th Avenue);Detroit, Michigan (13709 W. 8 Mile Rd.); and Memphis, Tennessee (3614 Lamar Ave.).

Consumer Electronic Sales During First Four Months of 1974 BelowLevels of Same Period in 1973

Total U.S. sales to dealers of all categories of consumer entertainment electronic prod-ucts during the first four months of 1974 were substantially below sales in the sameperiod of 1973, according to a report issued recently by the Electronic Industries As-sociation's (EIA) Marketing Services Department.

Color TV sales to dealers were down 7.6 percent in the first four months of 1974 oversales in the same period last year. Monochrome TV sales to dealers were down 11.5percent in the same period. Total TV set sales to dealers were down 9.3 percent in thefirst four months of 1974 from the level of sales in the same period in 1973.

WESCON '74 Sept. 10-13

The 1974 Western Electronic Show and Convention (WESCON) will be held Septem-ber 10-13 at the Los Angeles Convention Center.

Exhibitors at WESCON include a number of manufacturers who produce productsand test instruments for consumer electronic servicing.

Zenith '75 Color Line Includes Only One Tube Type Chassis

Of the approximately 52 color TV models introduced by Zenith in the company's 1975product line, only one, a hybrid 16 -inch portable receiver, contains receiving tubes. Theothers are all -solid-state.

By June 1975, the complete Zenith color TV line will be all -solid-state, according toWalter C. Fisher, Zenith sales and marketing executive vice president.

RCA to Phase Out Home Audio Products in 1975

RCA Consumer Electronics has announced that it will phase out of the home audioproducts business by next year and will concentrate solely on television -related homeentertainment products.

The 1975 line of home audio products will be the last such line of radios, audio tapeplayers and recorders, and phonograph equipment, including home stereo systems, to beoffered by RCA.

William C. Hittinger, RCA executive vice president, Consumer and Solid State Elec-tronics, said the decision to drop the home audio line "will enable us to marshal ourtechnological and marketing resources behind television -related products which continueto offer superior profit potential and an excellent worldwide growth outlook."

Teledyne Packard Bell Phasing Out Production of Home EntertainmentElectronic Products

Teledyne Packard Bell has announced that it plans to discontinue the production ofhome entertainment products. The phase out of television and stereo manufacturing atits plants in Nogales, Mexico, and Los Angeles, California, reportedly began in May.Marketing of Teledyne Packard Bell products will continue for the present throughexisting channels of distribution.

Packard Bell also announced that its retail dealers will continue to receive productsupport, parts availability and warranty service through Teledyne Service Company,which has ten parts depots and 55 service branches located in major cities throughout theUnited States.

Vermont Passes TV Technician Licensing Law

The Vermont State Legislature has passed a bill which provides for the licensing ofradio and television technicians, effective January 1, 1975. The bill recently was signedinto law by Vermont Governor Thomas Salmon.

12 ' ELECTRONIC TECHNICIAN/DEALER, AUGUST 1974

ELECTRONICASSOCIATION DIGESTInformation about the activities of national, state and local associa-tions of electronic servicers, dealers and manufacturers. Materialfor publication in this department should be addressed to: ServiceAssociation Digest, ET/D, 1 East First St., Duluth, Minn. 55802.

New York EASAC Elects New OfficersThe Electronic & Appliance Service Association Council,

Inc., (EASAC) Albany, New York, has announced electionof the following new officers: Henry Wawryck, Hicksville,president; Thomas Delaney, Long Island City, executivevice president; Hy Latman, Brooklyn, vice president -appliances; Warren Baker, CET, Albany, vice president -electronics; and Hy Sheffron, Brooklyn, treasurer.

EIA and AEM Agree on MergerThe Electronic Industries Association (EIA) has an-

nounced that it has agreed in principle to a merger of theAssociation of Electronic Manufacturers (AEM) into theDistributor Products Division (DPD) of EIA.

The EIA approval of the merger in principle followssimilar action by each of the two AEM Divisions, Easternand Central, at their respective June 4 and June 5 meetings.A joint EIA/AEM Merger Committee has been meetingfrequently since the beginning of the year to reach agree-ment on the principle terms of the merger, which have beenidentified as membership eligibility requirements, duesrates, and the organizational structure of the merged or-ganizations. Agreement on these matters, as well as a merg-er timetable, was reached by the Merger Committee onJune 10.

NARDA Institute of ManagementThe National Appliance and Radio -TV Dealers Associa-

tion's (NARDA) 20th annual Institute of Management willbe held August 11-16 at the University of Notre DameModern Center for Continuing Education, near SouthBend, Indiana.

The six -day Institute, which focuses on both fundamentaland advanced techniques for managing consumer electronicretailing and servicing businesses, offers three levels ofstudy: the First Year Class, for those attending for the firsttime; the Advanced Class, for everyone who previously at-tended the First Year Class; and the Graduate Class, forthose who have participated in two or more Institutes.

Topics which will be covered include: Watch Your Et-penses. Sales Budgeting Effectively, Problem Solving in theService Department, How to Organize and Profit from aCritique Group, Getting the Most Out of Your Cost -of -Doing -Business Survey, Looking at Your Store Image, andUsing Financial Statements More Effectively, plus manyother management -oriented topics.

Instructors include a number of nationally known man-agement authorities, including Dr. William R. Davidson(Management Horizons), Drs. Bernard J. Kilhride andJohn J. Malone (Notre Dame), Dr. Martin L. King (Uni-versity of Tennessee), and Dr. James Owens (AmericanUniversity).

Cost of the Institute is $180 for NARDA members and$225 for nonmembers, and includes tuition, housing (twoin a room), all meals and all materials. Registration can bemade in advance or at the Notre Dame Residence Hall(Juniper Road) on August 11. For more information, con-tact: NARDA (Phone 312-726-5583).

rBEFORE YOU

BUY A SWITCH...CONSIDER THIS-ELECTROGRAFTGIVES YOU... riMore than 120 switches

and accessories of alltypes and styles

All displayed on onefixture for easy selec-tion

Also available in bulkput -ups for quantityusers.

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48 page r.),catalogc3mpletewith tech-nical spe:s,templatesaid crossreferencea soavailable

GC ELECTRONICSDIVISION OF HYDROMETALS, INC. 0ROCK:ORD, ILLINOIS 61101 U.S.A.

A. for more details circle 112 on Reader Service Card

AUGUST 1974, ELECTRONIC TECHNICIAN/DEALER 13

Sony'sWide -Angle

TrinitronColor TV

by G. P. McGinty

GCS equipped horizontal

output, a unique

low -voltage regulator

system and a 114 -degree

Trinitron Color CRT

Most color TV receivers employsome type of power supply regulatorto compensate for variations in linevoltage. The Sony Model TV -1722employs a new type of switching -mode regulation which is driven bythe horizontal oscillator and is notonly very efficient but takes up verylittle cabinet space. The Gate Con-trolled Switch (GCS) used in theregulator circuit operates like anSCR except that it can be turnedoff by reverse current drive to thegate terminal. Another GCS is usedin the horizontal -output circuit.

This chassis also employs a newExcess Voltage Protection circuitwhich monitors the B+ voltage and,in case of a shorted circuit, theauxiliary circuit functions as a shut-down circuit to prevent damage tothe GCS and other sections of theTV receiver.

The Trinitron color picture tubehas a deflection angle of 114 de-grees and a cylindrical face plate

Sony's Model KV-1722 Color TV, which isequipped with the 114 -degree Trinitron color picture tube.

using continuous, vertical phosphorstrips.

The 114 -Degree Trinitron PictureTube

Like the earlier Trinitron picturetubes, the 114 -degree version fea-tures a cylindrical face plate usingcontinuous, vertically oriented phos-phor stripes which are backed by anaperature grille indexing mask thatemploys continuous, unbroken slots.The gun structure is shorter thanthat of previous Trinitrons, which,together with the 114 -degree deflec-tion angle, permits much shallowercabinet designs. In addition, theshorter distance between the muzzleof the electron gun and the phosphorsurface reduces the amount of elec-tron beam divergence caused by mu-tual repulsion of electrons within thebeam. This factor, aided by the re-duction in beam diameter made pos-sible by passing all three beamsthrough a common, large electron -

focusing lens, produces a very smalland dense beam at the points wherethe electrons strike the phosphors.This, in a nutshell, is why the Trini-trons produce relatively sharperfocus at high levels of brightness andcontrast.

Purity and ConvergencePurity and convergence adjust-

ments are simple and straightfor-ward in the Trinitrons because thevertical phosphor stripes are con-tinuous and the tiny vertical errorsin beam landing that can cause puri-ty problems in delta -type phosphordot tubes have no effect. (The samephosphor stripes are hit, just higheror lower.) Thus, purity adjustmentsare reduced to side -to -side aimingonly.

Because the electron beams arehorizontally in line, convergence isalso simplified. There is only onestatic convergence control, adjust-ment of which brings all three beams

14 1 ELECTRONIC TECHNICIAN/DEALER, AUGUST 1974

.. AO

Kay-Townes Long Ranger1 RUGGED TWIN LOCKING ELEMENT

BRACKET

2 IC AMPLIFIER BOARD-24dB GAIN-LOWNOISE-CHANNELS 2-83

3 DOUBLE MAST CLAMP PROVIDES LOWPROFILE FOR HIGH WIND RESISTANCE

4 EXTRA HEAVY CYCOLAC INSULATORS-ALL ELEMENTS ELECTRICALLY SHORTEDTO BOOM

6. INSULATION PIERCING. WEATHERPROTECTED TERMINALS

7 DUAL CORNER REFLECTOR BRACKETWITH DUAL LOCKING CLAMPS

8 DUAL BOOM BRACING. TWIN RIVETED

9 OPTIONAL TANDEM AMPLIFIERPROVIDING ADDITIONAL 6dB GAIN ATEACH OF FDUR OUTPUTS

%I

5. BROADBAND PARASITIC DIRECTORSYSTEM-HIGH GAIN-CHANNELS 14-83

ii I, *ANTENNA COMES COMPLETE WITH COAXIAL-, CABLE K!T FOR SIMPLE INSTALLATION

z i KAY-TOWNES, INC.cm-E1( iimorinc. III liIF Post Office Box 593 Rome, Georgia 301610 Turner Chapel Road Telephone (404) 235-0141

41111%114r

111111111111111p,

AIIIIIWP0

/

.----

, . 1 11111AIIIIPP.

1( 8

... for more details circle 122 on Reader Service Card

AUGUST 1974, ELECTRONIC TECHNICIAN/DEALER 15

together at the screen. Called the HSTAT control (see Fig. 1), it variesthe DC voltages applied between theinner and outer deflecting plates atthe muzzle of the electron gun. Inaddition to this primary control,there are two magnetic trim tabs,mounted on the neck assembly,which correct for static errors intwist or unequal spacing of the threebeams within manufacturers' toler-ances.

There is only one dynamic con-vergence knob to adjust, the TILTcontrol. Minor changes in horizontaland vertical dynamic amplitude aremade by wire -link selection on thedeflection PC board. Although thebasic setup adjustments are simpleand straightforward, there is no dif-ficulty in determining when you haveset the controls to the optimumpoints. Small disc magnets andpermalloy strips cemented to theyoke housing and tube funnel correctany small areas of misconvergenceat the corners of the tube. The tech-nician's only concern with these"doodads" is when the picture tubeneeds to be replaced. If you're goingto service the Trinitron, it is a goodidea to have a few disc magnets andpermalloy strips on hand. You can

get new ones from Sony or you canreuse those you save from dud tubes.

ServiceabilityChassis layout is clean, with all

printed -circuit boards positioned foreasy accessibility. They are mountedfoil -side -out to permit easy trouble-shooting, and silk-screened solderresist is used to label components.The all -solid-state circuitry employs26 transistors, 33 diodes, seven in-tegrated circuits (with the equiva-lent of 244 transistors), three gate -controlled switches and one FET. Allof these components are soldered in,and there are no plug-in modules.The tuners, the speakers and all cir-cuit components which are notmounted on the PC Boards are read-ily accessible (see Fig. 2.) Becausecoupling between the tuner and theIF circuits is accomplished by a flat,75 -ohm system (not the convention-al link -coupled over coupled stage),IF realignment is not required whenthe tuner is replaced.

GCS Horizontal OutputA new type of semiconductor de-

vice is used in the horizontal -outputstage. This is a gate -controlledswitch (GCS) which operates like

an SCR except that it can be turnedoff by reverse current drive to thegate terminal. (Once an SCR isturned on it can be turned off onlyby reducing the cathode to anodeforward current.) The GCS permitsefficient switching of the large cur-rents required for deflection, andwithstands high anode voltages dur-ing flyback. The GCS is driven bythe current waveform shown in Fig.3. The small positive spike on theleading edge of the pulse turns theGCS on during the trace interval,and the large negative spike on thetrailing edge is required to divertsufficient cathode current throughthe gate to turn off the GCS at theend of the trace. One vital factor,from a troubleshooting standpoint, isthat loss of drive to the GCS whileit is powered causes it to latch up inthe on state. This causes immediatefailure on the GCS. If you have to re-place a defective GCS, be sure thecorrect drive waveform is being ap-plied to the replacement before B+is applied to the output stage-moreabout this later.

Switching -Mode Power SupplyAll Sony TV receivers use a pow-

er supply regulator to ensure opti-

UHFEXT ANT

VHFEXT ANT

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Block diagram of Sony's Model KV-1722 color TV receiver.

12 V

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16 ELECTRONIC TECHNICIAN/DEALER, AUGUST 1974

mum performance and correct rastersize throughout the expected varia-tion in line voltage. Conventionalseries regulators are wasteful of bothpower and space. The pass transis-tor must dissipate quite a bit of pow-er and, consequently, is usuallymounted on a sizable heat sink. TheKV-1722, and the larger KV-1920,employ a new type of switching -mode regulator that is extremely ef-ficient and takes up little space. Ituses a GCS as the switching element.When used as an on/off device, theGCS consumes little energy-whenon, its voltage drop is close to zero;when off, no current flows. If thetransition between on and off israpid, the total power consumed isvery small.

The switch, Q603 in Fig. 4, is inseries with a 60 -Hz voltage doubler,which produces about 303 volts, andthe load, which requires a B+ of130 volts. On/off control for Q603is applied at the line rate of 15,750,and the control circuitry regulatesthe duty cycle of the switch. Becausethe supply operates at 15,750 Hertz,all ripple components are in syncwith the horizontal deflection and,consequently, filter components canbe quite small. The output is some -

PURITYADJUST

what like a 300 -volt (p -p) squarewave, but with the on time slightlyshorter than the off time. Outputafter filtering becomes 130 volts.Regulation is achieved by control-ling the percentage of on time foreach cycle.

A block diagram of the controlcircuit is shown in Fig. 5. The keyto control of the duty cycle is thepulse -width modulator (PWM).This is a monostable multivibratorthat is flipped into its unstable stateby a trigger obtained from the hori-zontal drive stage in the deflectionsystem. The duration of the unstablestate is determined by the ErrorAmp. This block compares the DCoutput of the supply with a Zenerreference voltage and supplies avoltage proportional to error. Theerror voltage, in turn, alters the biason the cutoff transistor in the PWMduring its unstable state and deter-mines how soon the PWM will flipback into its stable state. A rectang-ular -wave signal from the PWM isamplified by the regulator drivestage and applied to the gate of theGCS through a transformer. Thispermits the entire gate circuit to floatabove ground.

The basic operation of the control

H. STAT

Fig. 1-Purity and single convergence adjustment. (Horizontal Stat.:

TURN -ON

TURN-OFF

Fig. 3-Current waveform obtained at the GCS

SIGNALPROCESSING

loop is as follows: If output voltageshould increase for some reason, theError Amp detects the increase andsends a larger positive voltage to thePWM. This shortens the duration ofthe unstable state of the PWM mul-tivibrator which, in turn, reducesthe on time of the series -switchingGCS. We will return to the Build -Up circuit and EVP trigger later inthe analysis.

The PWM circuit is shown in Fig.6. Bias for the base of Q606 is ob-tained from the collector of Q607,so that, in the absence of drive, thestable state is Q607 on and Q606off. A 15,750 -Hz drive pulse, fromthe horizontal deflection system, isapplied to Q606 through a 560-pFcapacitor and an isolating diode.The pulse turns on Q606, the collec-tor voltage of which then decreasesto near zero. Capacitor C614 nowdischarges, applying a negative -go-ing pulse on the base of Q607, turn-ing off Q607. This is the unstablestate of the multivibrator, and itlasts until C614 is discharged suffi-ciently to permit Q607 to again con-duct. However, the off period forQ607 is also affected by the voltagedeveloped at the emitter of the ErrorAmp, transistor Q608. If the error

DEFLECTION-4--BOARD

POWER4,41110/ BOARD

TUNERASSEMBLY

Fig. 2-The layout of the chassis provides easy access to all boards andcomponents.

8ECT

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gate. Fig. 4-Simplified schematic of the Gate Controlled Series Switch circuit.

AUGUST 1974, ELECTRONIC TECHNICIAN/DEALER ; 17

voltage increases, Q607 will comeback into conduction sooner. Onething worth remembering is that theGCS switching regulator operates inphase with Q607. That is, the drivecircuitry is set up so that when Q607is off, the GCS is also off.

The drive circuitry for the switch-ing GCS is shown in Fig. 7. WhenQ607 of the PWM is turned off, itscollector voltage swings more posi-tive. This turns on drivers Q605 andQ604, which, in turn, create acrosstransformer T603 a voltage with thepolarity indicated by the uncircledpolarity signs in Fig. 7. Diode D607conducts at this time, "charging"L604. When Q607 conducts again,

Q604 and Q605 are cut off and thepolarity of voltage across the threereverses, as indicated by the circledpolarity signs in Fig. 8. This reversebiases D607, and the energy storedin L604 produces a voltage of theopposite polarity as the field aroundthe coil collapses. This produces thedrive current required to switch onQ603.

During the next transition, whenQ607 cuts off once again, polaritiesreverse once more. Now, however,because Q603 had been conducting,the reverse voltage is applied be-tween the cathode and the gate ofthe GCS, cutting it off. At the sametime, L604 is also "charged in paral-

WC

RECT Sit'i7C/1/#a(GCS)

BailDuo

LC/7/117/9

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Fig. 5-Block diagram of the power supply usedin Sony's Model rt1722 color TV receiver.

PWMERROR

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lel with the gate -cathode of 0603, tobe ready to turn on the GCS duringthe next operating condition.

Start and Shut -Down CircuitsBecause the switching -type regu-

lator system is driven by the hori-zontal oscillator, which, in turn, re-quires supply voltage to operate,some type of auxiliary system isneeded to get the horizontal oscilla-tor started. These starting circuitsare shown in Fig. 8. Most of thelow -voltage circuits, including thehorizontal oscillator and the drivecircuits for the regulator, operatefrom a +19 -volt source, which, afterthe set is turned on and operatingnormally, is produced by a pulserectifier driven from a winding onthe horizontal -output transformer.However, during a short periodwhen the set is turned on, a "kick-start" voltage is fed into the +19 -volt line. This kick-start voltage isdeveloped by charging C605 throughD608 from the 303 -volt output ofthe AC rectifier. This produces thevoltage needed to get the horizontaloscillator and drive circuits operat-ing. After C605 charges fully, nocurrent flows and the +19 -volt sup-ply must be supplied from its nor-mal source.

The kick-start circuit is helped bythe circuit shown in Fig. 8, block B.

Fig. 7-Simplified schematic of the GCS Drive circuit.

Fig. 6-The +19 -volt Start and Hold circuit.

18 ELECTRONIC TECHNICIAN/DEALER, AUGUST 1974

Fig. 9-Diagram of the Excess Voltage Protection circuit.

This system monitors the 19 volt lineas follows. If the 19 -volt line is low,Zener diode D610 does not conductand Q601 remains off. With Q601cut off, the gate of Q602 (anotherGCS) is biased on and a path existsfrom the 303 -volt line throughR608, Q602, and D605 to the +19 -volt line. This circuit helps supportthe +19 -volt line until it is suppliedby the normal source. It also pro-vides support for the +19 -volt lineif the set is switched off and on againrapidly. Under such conditions,kick-start capacitor C605 does nothave a chance to discharge andtherefore will not draw sufficientcurrent when power is applied.(Caution: The kick-start circuit willnot function if the input line voltageis increased slowly by using avariac.)

When the +19 -volt line beginsreceiving a normal flyback pulse in-put, Zener diode D610, in the basecircuit of Q601, conducts, turningon 0601. Conduction of Q601grounds the gate of Q602, and theauxiliary starting circuit is discon-

nected from the +19 -volt line.The auxiliary starting circuit also

functions as a special shut -down cir-cuit, to prevent the destruction ofthe GCS if its drive is lost. Thus,special consideration must be givento killing the horizontal -output stagesupply voltage before the drive volt-age is lost. To effect this conditionthe +19 -volt line is held constant(to keep the oscillator running)while the +130 v supply is"dumped." This function is accom-plished by the auxiliary starting cir-cuit. At turnoff, a decrease in the+19 -volt line turns off the zenerdiode transistor and 0601, switchingQ602 on, and the +130 -volt supplyis then fed into the +19 -volt linethrough R642, D604, Q602 andD605.

When troubleshooting the powersupply it is important to rememberthat the auxiliary starting circuit willtry to support the +19 -volt line if itis not receiving its normal input volt-age. For example, if horizontal driveis lost and the flyback input pulse tothe +19 -volt rectifier is absent, the

auxiliary starting circuit will be onand will try to keep the +19 -voltline constant. This causes overheat-ing of resistor R608 because it isnot rated for continuous duty.

Excess Voltage Protection CircuitIn a switching regulator circuit

with an approximate 50 -percent dutycycle, a shorted series switch will in-crease the B+ voltage to nearly thefull DC input (about 300v). Thismight cause failure of large sectionsof the television receiver. To preventsuch damage, the B+ is monitoredby transistor Q609 and Q610,shown in Fig. 9. If a shorted regu-lator causes the B+ voltage to in-crease above 150 volts, Q609 con-ducts and saturates Q610, shortingthe output of the horizontal oscilla-tor to ground. As a result, the hori-zontal -output GCS shorts and themain fuse is opened.

Troubleshooting the Power SupplyAlthough the switching -mode

power supply seemingly is complex,continued on page 52

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AUGUST 1974, ELECTRONIC TECHNICIAN/DEALER 19

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N EXTRAORDINARY OFFER.... for more details circle 103 on Reader Service Card

Replacement Color PictureTubes --ProppingUp Servicers' Profitsby Richard Deutsch 4004.

Increased income from the sale and installation

of replacement picture tubes can help offset

decrasineg income from sources which are drying up

because of technological, economic and marketing changes

My father-in-law onceowned a small resort hotel.One day, his brother, asuccessful businessman inSouth America whom hehad not seen for 30 years,arrived for a one -monthvisit. Day after day, therich brother watched myfather-in-law as he cateredto guests, fixed leaky fau-cets, did small carpentryjobs, worked the check -indesk and supervised hissmall staff. Finally, in ex-asperation, he said, "Har-old, I don't understandyou. You're always sobusy. When do you havetime to think about waysof making more money?"

I think this true storyaccurately describes thesituation of many consum-er electronic servicers anddealers today: They are sobusy with the day-to-dayoperation of their businessthey don't take the time tolook at the big picture, toanalyze the movement ofthe industry they're in, andto examine their own situ-ation and future prospectsin that industry. And that,after all, is what going todetermine how muchmoney they're going tomake 5 years from now,

or whether they'll even bein business at that time.

The consumer electronicsales and service markethas and is changing, andwill continue to change.These changes are, andwill continue to, affect theincome of dealers andservicers. The sooner theyrecognize the changes andadjust their business tothem, the less severe willbe the impact of thechanges on their income.

The Impact ofTechnology

Solid-state technologyand a byproduct of it,modular design of chassis,is, and will continue to, af-fect the consumer elec-tronic servicing market inthree principal, directways:

Incidence of serviceneed reduced by improvedreliability-The inherentreliability of solid-state de-vices, combined with ef-fective quality control atthe manufacturing level,promises to significantlyreduce the incidence ofneed for service. Thiseventually will significant-ly affect service labor in-come.

The author is vice president of Picture TubeOperations, Channel Master Division, Avnet, Inc.

Reduction of receiv-ing tube sales-Althoughthere is still a significantnumber of tube -type con-sumer electronic productsin use, as the ratio of all -solid -state vs tube -typeproducts in use shifts infavor of all -solid-stateproducts, as it will be do-ing in the next 5 to 6years, the reduction inprofit from sales of receiv-ing tubes, already felt bymany servicers, will ac-celerate.

All -electronic TVtuners will reduce tunercleaning income-Almostall of the major manufac-turers of TV receivers haveintroduced all -electronictuners in at least one or twoof their color TV models,particularly those sets thatare remotely controlled,and this trend seeminglywill gradually include allblack -and -white and colorTV receivers. As it does,income from tuner clean-ing and replacement willbe reduced at an increas-ing rate.

The Impact of Marketingand Pricing Changes

Two principal trends re-lated to the methods ofmarketing and pricing ofconsumer electronic prod-ucts will have an increas-

ing effect on dealers andservicers alike:

Mass merchandising-An increasingly largerpercentage of the total vol-ume of consumer electron-ic products is being mar-keted through mass mer-chandising and so called"discount" outlets. Con-tinuation of this trend un-doubtedly will significantlyreduce the retail incomeof independent consumerelectronic dealer/servicers,whose relatively smallervolume will not permitthem to price their mer-chandise competitivelywith that of mass mer-chants and discounters.

The effect of lower -priced products on servic-ing-Technology and man-ufacturing economies havegradually reduced the re-tail price of many consum-er electronic products and,despite inflation, will con-tinue to do so on a rela-tive basis. Already, manyconsumer electronic prod-ucts, such as personalportable and table modelradios, have been effec-tively priced out of theservicing market, and theprices of many personalportable black -and -whiteTV receivers are not farfrom the level at whichservicing of them will not

24 I ELECTRONIC TECHNICIAN/DEALER, AUGUST 1974

"FIX IT OR JUNK IT?"-FACTORS IN THE EQUATION

These are the elements that help determinewhether or not the consumer is likely toreplace his old picture tube or junk the setand buy a new one. Sometimes the decisionis as much the technician's as it is thecustomer's.

Age of existing set. (The older it is,the less likely the consumer is to keep it.)

Type of set. (A quality console withattractive wood cabinetry is often hard topart with, and the owner may be a better -than -average prospect for a replacementpicture tube.)

Life expectancy of set. (Regardless ofactual age, some sets are just too "used -up" to bother with, but others may be us-able for many years with a new CRT, an

extended warranty and some occasional rou-tine service. Your professional evaluationhere is important tc the customer.)

Cost of the replacement picture tube.(Flexibility in quoting labor charges maymake the difference between an order to"fix it" and "forget it.")

Cost of a new set. (Many new colorportables carry low price tags, and mightlook attractive to the customer compared tothe cost of a CRT replacement. However,the customer may not be too happy aboutexchanging his old 21- or 25 -inch set for asmaller portable-and once he starts think-ing about a large new console, that's thetime for the technician to point out howmuch cheaper it is to replace only the pic-ture tube, not the complete set. For thoseservicers/dealers wio also sell new sets, it

should be pointed out that the profit fromreplacing a co or CRT is considerably great-er than the profit from selling a new port-able, especially if you've got to price yoursets competitively with the mass merchan-disers.)

"Capture of the consumer." (The pic-ture tube extended warranty is a form ofservice contract that keeps the old set inoperation, prctects the consumer againstvery large, unexpected service costs over a3 -year period, gets you a service order, andgives you a "captive" customer who willcall you first whenever future service is re-quired on that set. The servicer/dealershould weigh these valuable benefitsagainst the a ternative of having the con-sumer ieave his store and buy a new setand service contract elsewhere.)

be economically feasible.

Action NowThese trends, although

well established, to datehave had only a relativelyminor impact on the in-come of consumer elec-tronic servicers and inde-pendent dealers. However,because all of these trendsare accelerating, servicersand dealers should beginnow their strategy for cop-ing with the effects ofthem. As some traditionalsources of income begin todecrease, other sourcesmust be sought to offsetsuch decreases, or existingsources of income whichare affected less by thesetrends should be more ful-ly exploited to take upsome of the slack.

A Continuing StableIncome Source:Replacement PictureTubes

One such existing sourceof income which not onlywill continue to exist butwill grow despite presenttrends is the sale and in-stallation of replacementpicture tubes. It will con-tinue as a profitable sourceof income for servicersand dealers during at leastthe next ten years andprob