Adio and Television

ADIO AND TELEVISION

A PUBLICATION OF RCA ELECTRONIC COMPONENTS AND DEVICES Geton the RCA COLOR -TV Bandwagon!

Vol. 29, No. 1

Available Through Your Participating Authorized RCA Test -Equipment Distributor (For complete details, see story on page 3) zontal -deflection coil in the yoke. Pulses WG-354A Probe Heightens Performance in these circuits run as high as 5,000 peak -to -peak volts. Two high -voltage capacitors in the Of RCA's WO -88A, WO -91A Oscilloscopes WG-354A probe comprise a voltage - divider circuit which attenuates the input pulse signal voltage by a factor of 20 to 1. In its "Low -Cap" function, the WG-300B Direct/Low-Capacitance luACAPACITANCE TYPE Probe has a 10 -to -1 attenuation. In v.,i,jr WC' "`VOLTAGE DIVIDER combination, the WG-300B and WG- 354A have a 200 -to -1 attenuation. Because RCA 'scopes such as the WO -88A and WO -91A have built-in voltage calibration,itis possible to Owners of RCA's WO -88A, WO - probe, a capacitance -type voltage di- measure high -voltage TV waveforms 91A, and similar -type oscilloscopes em- vider which snaps onto the front end directly on the oscilloscope screen. ploying the WG-300B probe will now of the WG-300B probe. Optional User price of the new WG- be able to observe and measure high - The WG-354A is particularly useful 354A probe isonly $7.50-an alto- voltage waveforms with amplitudes up in black -and -white and color -TV serv- gether worthwhile investment which to 5,000 peak -to -peak volts. icing-for observing and measuring thecan repay the service technician many These new capabilities are madepulse voltage at the plate of the hori- times in his routine troubleshooting possible by the new RCA WG-354Azontal -output tube and across the hori- and repair tasks.

WT -115A Designed Exclusively for Testing Color -TV Picture Tubes

From RCA-pioneer in compatible tivity meter with a 5 -inch, easy -to -movement against damage due to over- color television-comes an outstanding read, three -color scale providing quick load. test instrument designed specificallyand reliable indication of color picture Front panel controls on the WT -115A for precise measurement of perform-tube performance. A 0 -to -10 "Quality" include an adjustment to compensate ance characteristics of color picture meter scale indicates the emission ca-for variations in line voltage, a switch pability of each gun. A separate, to select the color gun to be tested, and tubes. smaller scale is used to measure inter - a control for accurately setting the The newly announced WT -115A electrode leakage and to establish theproper cutoff point for the testing of Color Picture Tube Tester has beenproper cutoff point for the gun beingeach color gun. correlated with the equipment used for tested. Readily portable and weighing only in -plant testing of RCA color picture Interelectrode shorts in the color 5 pounds, the instrument is provided tubes. gun are indicated by a neon lamp. This with a protective vinyl carrying case This portable tester rates-in a man-lamp also serves to protect the meterwhich has a special compartment for ner similar to the in -plant testing equip- storing the tester socket assembly and ment-each gun of the color picture power cord. A card explaining the basic test procedure is supplied with tube for emission quality, interelectrode the WT -115A and can be stored inside leakage, shorted elements, and warmup the case lid for quick reference. performance. Equally versatile for either in -set or The WT -115A features a high-sensi- out -of -set testing of color picture tubes, the unit operates from an ac power source of 108 to 132 volts, 50-60 cps. Power consumption is approximately 25 watts. Many of the color picture tube testers currently available do not have ILMILIC OF MCA in-ECTROMIC C011010 ..... OrVIC I1(TA RADIO & TELEVISION SERVICE provision for adjusting the cut-off point NEWS is published in the interest of for each gun, and do not provide accu- dealers and service technicians. It is written to assist them in providing rate heater voltage. Such testers often betterservice, and tofosterthe growth of their business by supply- indicate that one gun in the color pic- ing them with information on the latest troubleshooting and sales pro- ture tube is "bad," when actually, it is motion techniques, sales and service perfectly good. The RCA WT -115A aids, together with invaluable data on RCA tubes, transistors, batteries, has the essential cut-off adjustment fea- WINTER and electronic instruments. ture and it provides accurate heater 1963-64 voltage. !ICA RADIO & TELEVISION SERVICE NEWS is a quarterly publication of An extremely accurate instrument RCA Electronic Components and Color Picture Tube Tester is de- for the testing of color tubes in the Devices, Harrison, New Jersey. RCA'sWT -115A signed specifically for the testingof color -TVpic- customer's home or in the store, the WT -115A is available through author- ©1964 ture tubes, includingtypes 21AXP22, 21AXP22A, Vol IV Radio Corporation of America 21CYP22, 21CYP22A, 21FBP22, 21FJ22, and ized RCA test equipment distributors 21FKP22. at an Optional User price of $89.50.

2 RCA RADIO & TELEVISION SERVICE NEWS Available Free With Purchase of WR-64A Color-Bar/Dot/Crosshatch Generator Famed RCA Institutes Color -TV Home Study Course

Are you one of the 10,000 technicians who have been trained in color - TV servicing at RCA -sponsored work- shops? If not, there's still time to join the vanguard of dealer establishments prominently displaying "Expert Color - TV Service" signs by immediately tak- ing advantage of the following offer now available through your participating RCA test -equipment distributor: For a limited time only, your purchase of the popular WR-64A Color- Bar/Dot/Crosshatch Generator entitles you to free enrollment in the widely popular and proven RCA Institutes Color -TV Home Study Course. This famous four -group, eight -lesson series is your direct entry to the most promising field of television servicing. By broadening your technical skills into this flourishing field, you can share in the wide recognition and customer ac- system; and supplementary information.video circuits, remote control, and over- ceptanceof RCA asapioneer of Each of the seven remaining lessonsall servicing features. Lesson 6 covers compatible color television. is presented in equal or even greaterall aspects of receiver alignment and The home -study course provides youdetail with sections and sub -sectionsLesson 7 describes the most effective with all the fundamentals for trouble-covering every aspect of the lesson'stroubleshooting techniques. Finally, in shooting and repairing color receivers-main subject. Lesson 2 tells you allLesson 8, you learn about your com- regardless of make. about color picture tubes. Lesson 3plete workbench needs in test equip- Lesson 1 offers in clear and conciseinstructs you in the functions of thement and accessories, including the form the principles of color television. color receiver, while Lesson 4 dealshighly regarded WR-64A Color -Bar/ Eight separate sections cover an ele-with setups and adjustments. Lesson 5 Dot/Crosshatch Generator. mentary color television system; light introduces you to modern color -receiver The eight lessons are divided into and color; the color -TV signal; the prin-circuits-with emphasis on tuners, video four "Study Groups" of two lessons ciples of modulation; development ofIF amplifiers, sync and AGC circuits, each. Included with each Study Group the color -TV transmission standards; deflection and high -voltagecircuits, are examination papers which are for- recovering the chrominance signals atthe chrominance channel, demodula- warded to RCA Institutes for grading the receiver; an over-all view of thetors, color synchronization circuits,after the completion of each lesson. As each Study Group is successfully As an RCA -trained color -TV technician, you receive a handsome graduation certificate which can be completed, you automatically receive prominently displayed in your establishment for all customers to read and remember when con- the following Study Group. Your par- fronted with future servicing needs. ticipating authorized RCA test -equipment distributor will be happy to co- operate in providing you with all the necessary details on how to file the Application Form and obtain the handsome white vinyl binder containing Study Group I-your first two lessons. Your purchase of the WR-64A Color- Bar/Dot/Crosshatch Generator (available through authorized RCA test - equipment distributors at an Optional User price of $189.50) provides you with an outstanding value. This generator is one of the "Big -5" RCA electronic test instruments which fulfill all test requirements in color -TV servicing (see story on page 4). "Color" is already big business, and getting bigger every day. Use this extraordinary offer toward a profitable futurecareerin"Expert Color -TV Servicing." :PERT TV rvice 3 RCA's Mark VIII Transceiver Sets New Standards For High -Quality Performance in CB Equipment

Outstanding transmitting and receiving characteristics of RCA's Mark VIII 27 -Mc Citizens' Band 2 -Way Radio label this unit as a pacesetter among instruments of its type. A 5 -watt -input transmitter with over 3 watts output offers clean, crisp voice "'"'"VirTrirrifffrrnITY7-...... reproduction with full 100% -modula- ...... tion capability...... The intermediate frequency chosen ...... for the unit provides excellent image rejection. This feature, together with goodsignal-to-noiseratio,provides 0 high audio intelligibilityin the receiver. Performance of the receiver is further heightened by placement of the large speaker in the center of the front panel. Offering new styling, new convenience, and new versatility, the Mark VIII in many respects repre- The relatively low cost and simple sents a significant departure from ordinary Citizens' Band radio design. Its low, slim silhouette and operating features of the Mark VIII height of only 31/2 inches facilitate installation in extremely limited space, including under -the -dash make this highly dependable commu- mounting in many of today's smaller cars. nications transceiver useful in a wide variety of industrial, marine, business,de power cord for connection to the Rugged, compact, and lightweight and personal applications, includingtransceiver. Other features of the Markconstruction. vehicles, construction, farms, and ware-VIII include: The crystals are of the plug-in type, houses. Superheterodyne receiver with one and are fully accessible through two Operation of the Mark VIII is sim- RF and two IF amplifier stages. snap -lock trapdoors in the top of the ple, with only five operating controls Adjustable squelch circuit. metal cabinet. One pair of precision- on the front panel. An illuminated Automatic noise limiter. ground transmit- crystals "transmit" channel selector has nine Automatic volume control. for channel 7 is shipped with each fixed (crystal -controlled) channel posi- TVI trap. Mark VIII.Additionalcrystalsare tions. A tuneable receiver dial covering PI -type -output network for mostavailable for other CB channels. all 23 channels is calibrated in both efficient antenna match. Combining functional styling, low channel numbers and frequencies. The Electronic transmit/receive cost, and high -quality performance for illuminated "receive" channel selector switching. maximum customerappeal,RCA's has 10 positions, nine of which are High -impact -plastic push -to -talk Mark VIII27 -McCitizens'Band fixed (crystal -controlled) channel posi- ceramic microphone. 2 -Way Radio can be your winning item tions and a tenth position which Illuminated indicators for showingfor increased sales and profits in CB switches reception to the tuneable re- working channels. equipment. ceiver. "On/off"-volume and squelch are controlled by a dual -function knob. One of the most important features of the Mark VIII is the inclusion of an ac power supply in the transceiver. Separate de power supplies are available for either 12 -volt dc or 6 -volt dc operation. Either unit may be mounted on the firewall of the vehicle as a per- manent installation. The Mark VIII then can be plugged in for mobile use, and unplugged and carried into the home or office for base -station operation. In addition to permitting a transceiver of smarter size, this arrangement results in considerably lower costs for the user who doesn't require a mobile power supply in every unit. The power supplies come complete with brackets for under -the -dash mounting of transceiver in motor vehicles; hardware for installation of the power supply; bat- tery cable and clamps; and a fused

4 color contamination of the picture by random noise and other signal inter- ference. The color -killer stage performs this function. Like the bandpass amplifier, the color killer is keyed by a Across the Bench horizontal pulse from the flyback circuit so that it conducts only during the By Doc horizontal retrace period. During this time, it "looks" for the color -burst signal. If the burst signal is absent from If your shop was as busy as minekiller circuit,it had no effect. The the incoming horizontal sync pulse, the during the holidays, you're probably trouble lay in the color -sync or chrom-color killer biasesoff the bandpass glad they're over. With all the kidsinance circuits, which lined up asamplifier. Then, no information can home from school, the TV sets got ashown in the block diagram below.get through to the color demodulators, real workout-and so did my serviceMaybe you'll recognize the arrange-and no color will contaminate the bench. It seemed that every time Iment-it's from the RCA-21CT662U. black -and -white picture. When burst is tried to take a voltage measurement, When black -and -white performance present, the killer relaxes and lets the the telephone jingled. is okay but color is out, it's not difficult color section go to work. On top of all this, I got the darnedestto localize the trouble with a good That's a simple explanation that cov- job. Like any other request you get'scope and a color -signal source. It's ers a lot of chassis. But this basic knowl- from a steady customer, I couldn't turnmerely a matter of signal tracing. You edge will take you a long way when it down. can use either a color signal from ayou have a defective color set. It took It was the Friday before ChristmasWR-64A or one from a station. I pre- me only five minutes to isolate the and I had this color set jacked -up on fer the WR-64A because you can ad-trouble stage in that "662U." In my the bench. It had a bad case of color just levels as needed, and you're always next column, I'll tell you how I did it. lockout. Right in the middle of every-sure of having a standard color signal Meanwhile, here's a clue:I used a thing, Mrs. Caldwell charged into the when you want it. color -bar generator and a 'scope. store with a big box and plopped it Let's look at the layout in the di- Oh, yes-I almost forgot. Mrs. Cald- down on the counter. agram. Circuit functions are simple. well came back just before closing "Mr. Doc," she demanded, "fix this The bandpass amplifier is tuned to time. for me right away. I'll be back in twoabout 4 megacycles so it extracts and "Mr. Doc," she said happily, "I want hours." amplifies all the color information. This to tell you how delighted Mr. Caldwell Before I could take the pipe out ofinformation is fed to the demodulatorand I are with that music equipment my mouth, she dashed out the door. driver and the burst keyer. The de- you put in for us. It sounds wonderful Being curious, I cut the twine andmodulator driver provides amplified-especially on those stereo radio pro- lifted the box flaps. Maybe it was one3.58 -Mc sideband information to the grams." of those midget TV sets or (Heavencolor demodulators; the burst keyer Now, that made me feel pretty good. forbid) her new FM multiplex tuner. I amplifies the 3.58 -Mc color -sync signal "There's just one thing," she said, wasn't prepared for what I saw. taken from the back porch of the hori- hesitating. It looked like a barbed-wire en- zontal sync pulse. The keyer is gated "Here it comes," I said to myself as tanglement in living color. As I ginger- by a pulse from the flyback circuit so my happy -gear slowed down. "What is ly lifted the mess out of the box, two that it conducts only during the hori-it, Mrs. Caldwell," I asked aloud. "Is colored lamps dropped to the floor. Itzontal retrace period. anything wrong?" was six strings of Christmas -tree lights! The 3.58 -Mc sync signal from the "Oh my no. I was just wondering. "Well, Doc," I asked myself, "what burst amplifier is fed to the phase de- Do you think you could install a set are you supposed to do with this? Fixtector, which compares the phase of just like ours in my daughter's house- it,I guess. Perhaps it's out of align-the incoming burst signal with that ofin time for Christmas, of course? I ment. In that case,I can connect a the local 3.58 -Mc oscillator and feeds think it would make a nice present, sweep and marker generator across thea correction voltage to the reactance don't you?" line plug. Or maybe the color demod- tube. The reactance tube keeps the I couldn't have agreed more quickly. ulators are out and the green lights are 3.58 -Mc oscillator in correct step andWho wouldn't like to get a $600 Christ- flashing red. Now, if I just hook up the phase with the 3.58 -Mc signal from the mas present? WR-64A color -bar generator . . ." station. (Remember, color hues are de- "Then it's settled," she said. "Just Suddenly emerging from my flight termined by the phase relationship ofmake sure it's in before Wednesday. into fantasy,I was reminded of the the color signals.) Now, what do I owe you for fixing my color chassis that needed attention by That's the normal function of these tree lights?" the humming noise in the back room. I stages during a color transmission. For "Nothing-nothing at all, Mrs. Cald- bit hard on my pipe and started toblack -and -white reception, however, well," I blurted. "Glad to do it." work on the strings of lights. these stages must be cut off to prevent After all, it was Christmas. I finally got back to the color chassis. I had pulled the set when routine tube replacements and adjustments failed to Ist 2nd TO PICTURE-TUBE Block diagram show- VIDEO VIDEO INPUT -n DE -NYE CATHODES cure the trouble. ing portion of color SIGNAL AMPLIFIER AMPLIFIER Black -and -white performance was circuitry in the RCA- HOFftIMTAL good, and sound okay. But the set BANDPASS BLANKER 21CT662U color -tele- AMPLIFIER wouldn't perform on a color program. vision receiver. When I fed a color -bar signal from a COLOR WR-64A in the front end and adjusted KILLER

the threshold control in the color - t

DDREIMVOEDR.

TO COLOR DEMODULATORS Winter, 1963-64 BURST REACTANCE KEYER DETCEASTE0 R BE 3 -5('s -cm` Five RCA Instruments Answer Complete Test -Equipment Needs For Technicians Entering New Field of Color -TV Servicing The facts and figures point to oneoutput cable that connects directly to conclusion: "Color" has arrived-andthe antenna terminals of the receiver, is destined shortly to assume a major and elimination of the need for external role in the television servicing industry.sync leads. Crystal -controlled signals assure steady color -bar, dot, and cross- TELE-ASK:NI/FM %JEEP GEllERATOR The time to assure your place in this vital new market is now-through ahatch patterns free from "jitter" and wit winning combination of superior know- "crawl." Optional User price (with out- how and equipment-both available put cables): $189.50. through RCA. The WO -91A 5 -Inch Dual Band Os- Unrivaled experience and major ad- cilloscope is a heavy-duty, precision in- vancements by RCA in the field ofstrument which is capable of checking compatible color television provide the colorburst signals and troubleshooting ..va aft ingredients of a successful leadership wideband color circuits as well as other from which every service -dealer andtypes of circuits. A multi -scale cali- technician can benefit. brated graph screen makes measure- tits The famed Color -TV Home Studyment of peak -to -peak voltage as easy Course of RCA Institutes offers youas with a VTVM. Optional User price unexcelled training to help you realize (with direct/low-capacitance probe and important new sources of income (see cable,ground cable, and insulated WR-69A Television/FM Sweep Generator in- story on page 3). Now, to supple- clip): $249.50. cludes pre-set switch positions for all VHF tele- ment this knowledge with the finest vision channels and the FM broadcast band. work aids obtainable, RCA offers five outstanding electronic instruments tronic equipment operatinginthe which fulfillall your test -equipment 19 -Mc through 260 -Mc range. This needs in color -TV servicing. These in- highly versatile instrument combines struments are the WR-64A Color -Bar/ the functions of the multiple -marker Dot/ Crosshatch Generator, WO -91A generator,re -broadcasttransmitter, 5 -Inch Dual Band Oscilloscope, WR- and heterodyne frequency meter. Op- 69A Television/FM Sweep Generator, tional User price (complete with output cable and phone tip): $242.50. and WR-99A Crystal -Calibrated Mark- The WR-70A RF/IF/VF Marker er Generator. Adder is designed for use with a marker The WR-64A Color-Bar/Dot/Cross- generator (such as the WR-99A) and hatch Generator is a lightweight, port- a sweep generator (such as the WR- able instrument providing you with all 69A), and can be employed for RF, the essential color -TV test patterns. IF, and VF sweep alignment in both Simplicity of operation is assured color and black -and -white receivers. through such design features as a mini- mum number of controls (three), RF

WO -91A 5 -Inch Dual Band Oscilloscope features a new 2 -stage sync -separator circuit for stable horizontal -sweep lock -in on composite TV signals.

The WR-69A Television/FM Sweep Generator is specifically designed for visual alignment and troubleshooting of color and black -and -white TV receivers and FM receivers. The instrument is equipped with pre-set switch positions for all VHF television channels. The FM broadcast band, TV video, chrominance, and TV and FM intermediate frequencies are also available. Optional User price (including all necessary cables) :$295.00. The WR-99A Crystal -Calibrated WR-99A Crystal -Calibrated Marker Generator WR-64AColor-Bar/Dot/Crosshatch Generator Marker Generator supplies a funda- combines the functions of the multiple -marker provides 10 color bars for accurate demodulator mental frequency RF carrier of crystal generator, re -broadcast transmitter, and hetero- alignment; a stable crosshatch pattern for ad- accuracyforaligning and trouble- dyne frequency meter, and contains facilities for justing linearity, raster size, and overscan; and shooting color and black -and -white re- checking calibrationat 240 separate crystal a small -dot pattern for convergence adjustments. ceivers, FM receivers, and other elec- checkpoints.

6 RCA RADIO & TELEVISION SERVICE NEWS IN111 RCA 5 -Inch Oscilloscope for Color -TV Up -Dated Irformation Serves Users of RCA's WT -1 10A Tube Tester 1 -BarIllotl RCA Color 411 Generator Fourth Supplement to RCA Card -Punch Data Jill Crosshatch Booklet Features 105 New Receiving Types a.RCA TelevisionFM Sweep Generator i s Am 11111 -Crystal OATH SUPPLEMENT CARD TO PUNCH PUNCH 1:1Generator CARD DATA Marker FOR THE BOOKL i ior ET UTOMATIC RCA INT-II0A -110A 1.11[1.1 $4,14 ELECTR WT M1 a Los? or so, RCA TESTER TUBE TESTER RCA RF /IF /VF JIM ElECIRON-113BE Marker Adder 1961 ...... 41. AlOOMATIC 119SU AO +.... an . . . lIMENNemmumffil mil mONINWriv--- IMMO MEM co...ft,* 7"3/031 Mil Wm - .....' "...".. ''''' Y..

Service technicians employing theeluded in Supplement 4 are instruc- RCA WT -110A Automatic Electron -tions for building a simple 7 -pin nu- Tube Tester now can obtain completevistor socket adaptor. card -punch data on 105 recently announced entertainment -receiving -tube WR-70A RF/IF/VF Marker Adder eliminates dis- types. Distributors Still Offer tortion of sweep -response pattern and provides This information, which includesNumerous Accessory Items very high -Q markers producing high amplitude card -punch data on the latest 7 -pin and narrow bandwidth. nuvistor, 9 -pin novar, and 10 -pin and For Older Test Equipment 12 -pin tube types,iscontained in Among its numerous advantages are "Supplement 4" to the Card -Punch With surprisingly few exceptions, very high -Q markers of high amplitude Data booklet 10E-234. The new 20 - and narrow bandwidth, and elimina- probes, cables, and other accessory page supplement, dated January, 1964, items for 'test instruments no longer in tion of sweep -response -pattern distor-is available through authorized RCA tion in visual alignment techniques. the RCA line are still being offered by tube distributors at an Optional List distributors. Optional User price (complete withprice of 50 cents. cables): $74.50. As a service to technicians who wish Together, these five instruments can Altogether, over 500 tube types areto keep advised of all currently avail- provide you with complete equipmentlisted in the new supplement, whichable items, RCA periodically publishes capability for all aspects of color -TV supersedes Supplements 1, 2, and 3. a list that includes accessories for more servicing. For more detailed informa-Service technicians obtaining Supple-than 70 current and discontinued oscil- tion on the WO -91A, WR-69A, WR-ment 4 as a necessary adjunct to the loscopes, meters and VoltOhmysts®, 70A, and WR-99A, ask your authorized10E-234 will thus be assured of up-to- signalgenerators,Chanalysts®, and RCA test equipment distributor for date card -punch information on nearly other test instruments. The most re- catalog sheets 1Q1092 through 1Q1095. 2,000 tube types, including foreigncent of these lists is Form EI-152. Further details on the WR-64A Color-makes. Available accessories are listed di- Bar/Dot/Crosshatch Generator are Data on 9 -pin novars and 10 -pin andrectly under their related instruments, provided in the 1Q1034 flyer. 12 -pin tube types is presented in atogether with stock or type numbers As a pioneer in compatible colorseparate section. Featured in this sec-for convenience in ordering. Wherever television, it is only natural that RCA-tion is a complete set of instructions,possible, suitable replacements have through your local RCA distributor-iswithaccompanying schematicand been listed for original -type accessories in the position to offer the best equip-parts list, for construction and use ofno longer available. ment you need to service color -TVthe special adaptor employed for test- To obtain a copy of the Form receivers. Now's the time to decideing these tubes in the WT -110A. IfEI-152, send your request to: Com- what instruments you want for yourdesired, a simplified adaptor can be mercial Engineering, RCA Electronic immediate requirements and the newconstructed using only one or two ofComponents and Devices, 415 South business that lies ahead. these three tube socket types. Also in -Fifth Street, Harrison, N. J.

Winter, 1963-64 7 T.ashnIc./ ...Awe 'pc -as Or- 0n 3 7, n--9. 3 * oz vi CA CEIVING Oco - Co 0-CT- CINVICAL SERIES SCUBE NUAL at =I MOM UMW

U. U. '4W0/0 (040WIIAll CORP0.14170# if .0" IMO pikvi 4411671 BETTER THAN EVER! 6166 RCAThe latestRECEIVING edition TUBE of the MANUAL. famous JUST OUT! 1.= C7 15:r- Ca 7.7 rn r7: referencemanual-toEach year ofwekeep its expand kind it the in and mostelectronics. improve popular our and famous up-to-date receiving tube tube .--.,- 'Vlo (7) C7 r - r--1 -3 almostThe latest 100 edition-RC-22--ispages longer than the the biggestprevious and edition. best ever... It features. (1) (2) yo-p rn I r - OverAn expanded 100 new andtube completely types (1) detailed applications guide (2) - 0%.0 r- 0 New circuit diagramsNuvistorizedFMAMCitizens' for: -FMStereo Radio Band Multiplex FM ReceiverTransceiver Tuner Adapter (3) (4) C- NOW AVAILABLE FROM YOUR AUTHORIZED...andAll -Purpose RCA much, TUBE Power DISTRIBUTOR.much Supplymore! TheRCA Mc Electr,mic Components and Devices, Harrison, N.J. rusted Name in Electronics (3) (4) RADIO AND TELEVISION

I A PUBLICATION OF RCA ELECTRONIC COMPONENTS AND DEVICES

Geton the RCA COLOR -TV Bandwagon!

WINTER 1963-64

Available Through Your Participating Authorized RCA Test -Equipment Distributor (For complete details, see story on page 3) RCA's Mark VIII Transceiver Sets New Standards For High -Quality Performance in CB Equipment

Outstanding transmitting and receiving characteristics of RCA's Mark VIII 27 -Mc Citizens' Band 2 -Way Radio label this unit as a pacesetter among instruments of its type. A 5 -watt -input transmitter with over 3 watts output offers clean, crisp voice reproduction with full 100% -modulation capability. The intermediate frequency chosen for the unit provides excellent image rejection. This feature, together with good signal-to-noiseratio,provides high audio intelligibilityin the receiver. Performance of the receiver is further heightened by placement of the large speaker in the center of the front panel. Offering new styling, new convenience, and new versatility, the Mark VIII in many respects repre- The relatively low cost and simple sents a significant departure from ordinary Citizens' Band radio design. Its low, slim silhouette and operating features of the Mark VIII height of only 31/2 inches facilitate installation in extremely limited space, including under -the -dash make this highly dependable commu- mounting in many of today's smaller cars. nications transceiver useful in a wide variety of industrial, marine, business,dc power cord for connection to the Rugged, compact, and lightweight and personal applications, includingtransceiver. Other features of the Markconstruction. vehicles, construction, farms, and ware-VIII include: The crystals are of the plug-in type, houses. Superheterodyne receiver with oneand are fully accessible through two Operation of the Mark VIII is sim- RF and two IF amplifier stages. snap -lock trapdoors in the top of the ple, with only five operating controls Adjustable squelch circuit. metal cabinet. One pair of precision- on the front panel. An illuminated Automatic noise limiter. ground transmit - and - receive crystals "transmit" channel selector has nine Automatic volume control. for channel 7 is shipped with each fixed (crystal -controlled) channel posi- TVI trap. Mark VIII.Additionalcrystalsare tions. A tuneable receiver dial covering PI -type -output network for mostavailable for other CB channels. all 23 channels is calibrated in both efficient antenna match. Combining functional styling, low channel numbers and frequencies. The Electronic transmit/receive cost, and high -quality performance for illuminated "receive" channel selector switching. maximum customerappeal,RCA's has 10 positions, nine of which are High - impact -plastic push -to - talk Mark VIII27 -McCitizens'Band fixed (crystal -controlled) channel posi-ceramic microphone. 2 -Way Radio can be your winning item tions and a tenth position which Illuminated indicators for showingfor increased sales and profits in CB switches reception to the tuneable re- working channels. equipment. ceiver. "On/off"-volume and squelch are controlled by a dual -function knob. One of the most important features of the Mark VIII is the inclusion of an ac power supply in the transceiver. Separate dc power supplies are available for either 12 -volt de or 6 -volt dc operation. Either unit may be mounted on the firewall of the vehicle as a per- manent installation. The Mark VIII then can be plugged in for mobile use, and unplugged and carried into the home or office for base -station operation. In addition to permitting a transceiver of smaller size, this arrangement results in considerably lower costs for the user who doesn't require a mobile power supply in every unit. The power supplies come complete with brackets for under -the -dash mounting of transceiver in motor vehicles; hardware for installation of the power supply; bat- tery cable and clamps; and a fused

4 color contamination of the picture by random noise and other signal inter- ference. The color -killer stage performs this function. Like the bandpass amplifier, the color killer is keyed by a horizontal pulse from the flyback circuit so that it conducts only during the horizontal retrace period. During this time, it "looks" for the color -burst signal. If the burst signal is absent from If your shop was as busy as minekiller circuit,it had no effect. The the incoming horizontal sync pulse, the during the holidays, you're probablytrouble lay in the color -sync or chrom- color killer biasesoff the bandpass glad they're over. With all the kidsinance circuits, which lined up asamplifier. Then, no information can home from school, the TV sets got ashown in the block diagram below.get through to the color demodulators, real workout-and so did my serviceMaybe you'll recognize the arrange-and no color will contaminate the bench. It seemed that every time Iment-it's from the RCA-21CT662U. black -and -white picture. When burst is tried to take a voltage measurement, When black -and -white performance present, the killer relaxes and lets the the telephone jingled. is okay but color is out, it's not difficult color section go to work. On top of all this, I got the darnedest to localize the trouble with a good That's a simple explanation that cov- job. Like any other request you get'scope and a color -signal source. It's ers a lot of chassis. But this basic knowl- from a steady customer, I couldn't turnmerely a matter of signal tracing. Youedge will take you a long way when it down. can use either a color signal from ayou have a defective color set. It took It was the Friday before ChristmasWR-64A or one from a station. I pre-me only five minutes to isolate the and I had this color set jacked -up on fer the WR-64A because you can ad-trouble stage in that "662U." In my the bench. It had a bad case of color just levels as needed, and you're always next column, I'll tell you how I did it. lockout. Right in the middle of every-sure of having a standard color signalMeanwhile, here's a clue:I used a thing, Mrs. Caldwell charged into the when you want it. color -bar generator and a 'scope. store with a big box and plopped it Let's look at the layout in the di- Oh, yes-I almost forgot. Mrs. Cald- down on the counter. agram. Circuit functions are simple. well came back just before closing "Mr. Doc," she demanded, "fix this The bandpass amplifier is tuned to time. for me right away. I'll be back in twoabout 4 megacycles so it extracts and "Mr. Doc," she said happily, "I want hours." amplifies all the color information. This to tell you how delighted Mr. Caldwell Before I could take the pipe out ofinformation is fed to the demodulatorand I are with that music equipment my mouth, she dashed out the door. driver and the burst keyer. The de- you put in for us. It sounds wonderful Being curious, I cut the twine andmodulator driver provides amplified-especially on those stereo radio pro- lifted the box flaps. Maybe it was one3.58 -Mc sideband information to the grams." of those midget TV sets or (Heavencolor demodulators; the burst keyer Now, that made me feel pretty good. forbid) her new FM multiplex tuner. I amplifies the 3.58 -Mc color -sync signal "There's just one thing," she said, wasn't prepared for what I saw. taken from the back porch of the hori- hesitating. It looked like a barbed-wire en- zontal sync pulse. The keyer is gated "Here it comes," I said to myself as tanglement in living color. As I ginger- by a pulse from the flyback circuit so my happy -gear slowed down. "What is ly lifted the mess out of the box, two that it conducts only during the hori-it, Mrs. Caldwell," I asked aloud. "Is colored lamps dropped to the floor. It zontal retrace period. anything wrong?" was six strings of Christmas -tree lights! The 3.58 -Mc sync signal from the "Oh my no. I was just wondering. "Well, Doc," I asked myself, "what burst amplifier is fed to the phase de- Do you think you could install a set are you supposed to do with this? Fixtector, which compares the phase ofjust like ours in my daughter's house- it,I guess. Perhaps it's out of align-the incoming burst signal with that ofin time for Christmas, of course? I ment. In that case, I can connect athe local 3.58 -Mc oscillator and feeds think it would make a nice present, sweep and marker generator across the a correction voltage to the reactance don't you?" line plug. Or maybe the color demod- tube. The reactance tube keeps the I couldn't have agreed more quickly. ulators are out and the green lights are3.58 -Me oscillator in correct step andWho wouldn't like to get a $600 Christ- flashing red. Now, if I just hook up the phase with the 3.58 -Mc signal from the mas present? WR-64A color -bar generator . . ." station. (Remember, color hues are de- "Then it's settled," she said. "Just Suddenly emerging from my flighttermined by the phase relationship ofmake sure it's in before Wednesday. into fantasy,I was reminded of the the color signals.) Now, what do I owe you for fixing my color chassis that needed attention by That's the normal function of these tree lights?" the humming noise in the back room. I stages during a color transmission. For "Nothing-nothing at all, Mrs. Cald- bit hard on my pipe and started toblack -and -white reception, however, well," I blurted. "Glad to do it." work on the strings of lights. these stages must be cut off to prevent After all, it was Christmas. I finally got back to the color chassis. I had pulled the set when routine tube Ist replacements and adjustments failed to DE ILNAEY TO PICTURE-TUBE Block diagram show- INPUT VIDEO VIDEO CATHODES cure the trouble. ing portion of color SIGNAL AMPLIFIER AMPLIFIER Black -and -white performance was circuitry in the RCA- good, and sound okay. But the set BANDPASS BLANKER H HORIZONTAL 21CT662U color -tele- AMPLIFIER PULSE wouldn't perform on a color program. vision receiver. When I fed a color -bar signal from a I COLOR WR-64A in the front end and adjusted KILLER the threshold controlin the color -

DEMOD. DRIVER TO COLOR Winter, 1963-64 DEMODULATORS BURST PHASE RE ArCuTtfit,s1 C E 3.58-Mc KEYER OSC Five RCA Instruments Answer Complete Test -EquipmentNeeds For Technicians Entering New Field of Color -TV Servicing The facts and figures point to one output cable that connects directly to conclusion: "Color" has arrived-andthe antenna terminals of the receiver, is destined shortly to assume a major and elimination of the need for external role in the television servicing industry. sync leads. Crystal -controlled signals The time to assure your place in this assure steady color -bar, dot, and cross- vital new market is now-through ahatch patterns free from "jitter" and winning combination of superior know- "crawl." Optional User price (with out- how and equipment-both available put cables): $189.50. through RCA. The WO -91A 5 -Inch Dual Band Os- Unrivaled experience and major ad-cilloscope is a heavy-duty, precision in- vancements by RCA in the field ofstrument which is capable of checking compatible color television provide the colorburst signals and troubleshooting ingredients of a successful leadershipwideband color circuits as well as other from which every service -dealer andtypes of circuits. A multi -scale cali- technician can benefit. brated graph screen makes measure- The famed Color -TV Home Studyment of peak -to -peak voltage as easy Course of RCA Institutes offers youas with a VTVM. Optional User price unexcelled training to help you realize (with direct/low-capacitance probe and important new sources of income (seecable,ground cable, and insulated WR-69A Television/FM Sweep Generatorin- story on page 3). Now, to supple-clip): $249.50. cludes pre-set switch positions for all VHF tele- ment this knowledge with the finest vision channels and the FM broadcast band. work aids obtainable, RCA offers five outstanding electronic instruments tronic equipment operatinginthe which fulfillall your test -equipment 19 -Mc through 260 -Mc range. This needs in color -TV servicing. These in- highly versatile instrument combines struments are the WR-64A Color -Bar/ the functions of the multiple -marker Dot/ Crosshatch Generator, WO -91A generator,re -broadcasttransmitter, 5 -Inch Dual Band Oscilloscope, WR- and heterodyne frequency meter. Op- 69A Television/FM Sweep Generator, tional User price (complete with out- WR-70A RF/ IF / VF Marker Adder, put cable and phone tip): $242.50. and WR-99A Crystal -Calibrated Mark- The WR-70A RF/IF/VF Marker er Generator. Adder is designed for use with a marker The WR-64A Color-Bar/Dot/Cross- generator (such as the WR-99A) and hatch Generator is a lightweight, port- a sweep generator (such as the WR- able instrument providing you with all 69A), and can be employed for RF, the essential color -TV test patterns. IF, and VF sweep alignment in both Simplicity of operation is assured color and black -and -white receivers. through such design features as a mini- mum number of controls (three), RF

WO -91A 5 -Inch Dual Band Oscilloscope features a new 2 -stage sync -separator circuit for stable horizontal -sweep lock -in on composite TV signals.

The WR-69A Television/FM Sweep Generator is specifically designed for visual alignment and troubleshooting of color and black -and -white TV receivers and FM receivers. The instrument is equipped with pre-set switch positions for all VHF television channels. The FM broadcast band, TV video, chrominance, and TV and FM intermediate frequencies are also available. Optional User price (including all necessary cables) :$295.00. The WR-99A Crystal -Calibrated WR-99A Crystal -Calibrated MarkerGenerator WR-64A Color-Bar/Dot/Crosshatch Generator Marker Generator supplies a funda- combines the functions of the multiple -marker provides 10 color bars for accurate demodulator mental frequency RF carrier of crystal generator, re -broadcast transmitter, and hetero- alignment; a stable crosshatch pattern for ad- accuracyforaligning and trouble- dyne frequency meter, and contains facilities for justing linearity, raster size, and overscan; and shooting color and black -and -white re- checkingcalibrationat 240 separate crystal a small -dot pattern for convergence adjustments. ceivers, FM receivers, and other elec- checkpoints.

6 RCA RADIO & TELEVISION SERVICE NEWS 4 O'" DM 111 IMI m41. RCA 5 -Inch Oscilloscope 11Mmifor Color -TV Up -Dated Information Serves Users of RCA's WT -110A Tube Tester inan 1 II ill IN RCAColor-Bar/Doti Generator Fourth Supplement to RCA Card -Punch Data Al Crosshatch IN .i.IIIE Booklet Features 105 New Receiving Types ill RCA TelevisionFM MI Sweep Generator I-N. Ai Ma Crystal-calibrated Rtp DATA PUNCH Ca RD PUNCSUPPLEM IM Se"Vat CARD DATA Marker FOR BOOKL for THE RCA AUTOMATIC tift./10A ET L -110A ,04, 110,14111. ELECTRON RCA TESTER TUBE is RCA RF /IF /VF -TUBE :ESTER AUTOMATICELECTRON V Marker Adder 561 LIM lAsuort lIMMIIMEN Mom NimM sommium1VININIIIIMM mum inr.'

Service technicians employing theeluded in Supplement 4 are instruc- RCA WT -110A Automatic Electron -tions for building a simple 7 -pin nu- Tube Tester now can obtain completevistor socket adaptor. card -punch data on 105 recently announced entertainment -receiving -tube YVR-70A RF/IF/VF Marker Adder eliminates dis- types. Distributors Still Offer tortion of sweep -response pattern and provides very high -Q markers producing high amplitude This information, which includesNumerous Accessory Items and narrow bandwidth. card -punch data on the latest 7 -pin nuvistor, 9 -pin novar, and 10 -pin and For Older Test Equipment 12 -pin tube types,iscontained in Among its numerous advantages are "Supplement 4" to the Card -Punch With surprisingly few exceptions, very high -Q markers of high amplitude Data booklet 10E-234. The new 20 - and narrow bandwidth, and elimina- probes, cables, and other accessory page supplement, dated January, 1964, items for test instruments no longer in tion of sweep -response -pattern distor- is available through authorized RCA tion in visual alignment techniques. the RCA line are still being offered by tube distributors at an Optional List distributors. Optional User price (complete with price of 50 cents. cables): $74.50. As a service to technicians who wish Together, these five instruments can Altogether, over 500 tube types are to keep advised of all currently avail- provide you with complete equipmentlisted in the new supplement, which able items, RCA periodically publishes capability for all aspects of color -TVsupersedes Supplements 1, 2, and 3. a list that includes accessories for more servicing. For more detailed informa-Service technicians obtaining Supple- than 70 current and discontinued oscil- tion on the WO -91A, WR-69A, WR-ment 4 as a necessary adjunct to the loscopes, meters and VoltOhmysts®, 70A, and WR-99A, ask your authorized 10E-234 will thus be assured of up-to- signalgenerators,Chanalysts®, and RCA test equipment distributor for date card -punch information on nearlyother test instruments. The most re- catalog sheets 1Q1092 through 1Q1095. 2,000 tube types, including foreign cent of these lists is Form El -152. Further details on the WR-64A Color- makes. Available accessories are listed di- Bar/Dot/Crosshatch Generator are Data on 9 -pin novars and 10 -pin and rectly under their related instruments, provided in the 1Q1034 flyer. 12 -pin tube types is presented in atogether with stock or type numbers As a pioneer in compatible colorseparate section. Featured in this sec- for convenience in ordering. Wherever television, it is only natural that RCA-tion is a complete set of instructions,possible, suitable replacements have through your local RCA distributor-is withaccompanying schematicand been listed for original -type accessories in the position to offer the best equip- parts list, for construction and use ofno longer available. ment you need to service color -TVthe special adaptor employed for test- To obtain a copy of the Form receivers. Now's the time to decideing these tubes in the WT -110A. IfEI-152, send your request to: Com- what instruments you want for yourdesired, a simplified adaptor can bemercial Engineering, RCA Electronic immediate requirements and the newconstructed using only one or two ofComponents and Devices, 415 South business that lies ahead. these three tube socket types. Also in -Fifth Street, Harrison, N. J.

Winter, 1963-64 7 _a Ca_afD alD crl- -e.CO C 1 CCrrt -t.tDa to BETTER THAN EVER! 10/4/( ' ;Or . TheRCA latest RECEIVING edition TUBEof the MANUAL famous JUST OUT! OAPIU, ThereferencemanualEach latest year edition-to ofwe keep its expand kind-RC-22 it the in andmostelectronics. -is improvethe popular biggest our and famousand up-to-date best receiving ever... tube tube Crt OverAnalmost expanded 100 100new pages andtube completely types longer (1) than detailed the previous applications edition. guide (2) It features. ci)Vf New circuit diagramsNuvistorizedFMAMCitizens' for: -FMStereo Radio Band Multiplex FM ReceiverTransceiver Tuner Adapter (3) (4) NOW AVAILABLE FROM YOUR AUTHORIZED...andAll -Purpose RCA much, TUBE Power DISTRIBUTOR.much Supplymore! m Jr The Mt.RCA Electr-nic Components and Devices, Harrison, N.J. :rusted Name in Electronics (3) (4)