IN THIS ISSUE: TV Service 0 - Worldradiohistory

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IN THIS ISSUE:TV Service 0Build This BatBad AcousticVideo A

Equally MatchedThere's no place for a "weight advantage" in theassembly of a vibrator. Unless every part is accurately matched to every other part the performanceof the vibrator will be erratic.Mallory vibrator parts are measured to a minutefraction of an inch and then assembled so thatrelated parts match accurately. The reed matchesthe reed arms, the reed arms match each other,the weight matches the reed, and the contactsthan all other makes combined. That's convincing proof they are the best replacement vibrators for you to stock.In addition to assured quality, Mallory offersthe most complete vibrator line in the business.Mallory standardization permits 12 basic vibrators to meet 90% of your replacement require-ments. But a complete line of 52 vibrators isavailable to meet virtually every vibrator need.match the assembly. Even thefinest scale could not registera significant difference.Mallory Vibrators Makethe Best ReplacementsCareful manufacturing makesThe Mallory "Good Servicefor Good Business" Planwill increase business and profits in your shop.A unique follow-up file makes it easy tokeep customers.Mallory vibrators free ofThe Mallory Replacement VibratorGuide is free. The Vibrator DataBook is 1.00-from your distributoror by mail.You tie in withbounce and chatter, dependable in starting, and reliablein operation. More of themMallory acceptance todevelop new business-ask your distributor about it.are used in original equipmentMORE MALLORY VIBRATORS ARE IN USE THAN ALL OTHER MAKES COMBINEDNVP.R.MALLORV&CO.,Inc.MALLORCAPACITORS .SWITCHES . CONTROLS . RESISTORS . VIBRATORS . RECTIFIERS .VIBRAPACK* POWER SUPPLIES. FILTERS*Reg. U.S. Pat. Off.P. R. MALLORY & CO., Inc., INDIANAPOLIS 6, INDIANA

A stanwhich al u emay be measuredGENERALELECTRICFIRST AND GREATEST NAME IN ELECTRONICSRADIO SERVICE DEALER JULY, 1948

EDITORIALby S. R. COWANVOL.9TV Service Policies May Be NixedAt RMA's recent annual Convention,Norman Cooper, Stewart -Warner's service manager, came up with a suggestionwhich the RMA Service Committee hasrecommended to its membership; favorable action upon which we most emphatically endorse. The recommenda-tion is: that RMA's standard 90 daywarranty be extended to TV receiversales; also that insurance provisionsnow offered to TV set purchasers beMember of theAudit Bureau ofNO.7CirculationsSANFORD R. COWAN, Editor & Publishersimilarly limited to 90 days.In other words, as we have urged sincethe advent of TV sales, the basic job ofSAMUEL L. MARSHALL, Technical Editorclusive appointees" should be stopped infavor of wide-open free enterprise whereby any and all radio technicians shouldbe allowed to compete for the jobs.JULY, 1948installing and then servicing TV setsfor a 1 year (or longer) period by "ex-Mr. Cooper stressed a point of greatmerit, when making his recommendation, that all service dealers and serviceorganizations should act at once to protect their own and the public's equity inTV installation and sales business. SaidMr. Cooper, "The servicing fraternitymust promulgate a plan whereby thepublic can buy, on a pre -fixed fee basis,what can logically be called "RadioService Insurance."A full and comprehensive outline ofMr. Cooper's views in this regard will befound in his "Letter to the Editor"appears on page 6 of this issue.It will not be easy to determine whatscale of fees should be established at theoutset, for in cities where there are butone or two TV transmitters the installation problems will be so much less complex than in locales where up to sevenstations may ultimately be on the air.But at least, here is a vital subject thatall radiomen must work upon at once.We offer but one tentative suggestion forthe present, i.e., try to work out your"Service Insurance Plan" on a 3 -partbasis wherein the basic installation andfirst 3 -months of adjustment -maintenance accounts for Plan 1; while the next3 -month period is covered for any servicing required, under Plan 2; and then havethis followed up by Plan 3 to consistof subsequent 3 -month duration maintenance period contracts that could berenewed indefinitely, as they expire, atreduced premiums, with the proviso thatafter the first 90 -day period only workmanship and not required replacementparts would be under warranty:EditorialField Findings, by S. R. CowanA resume of Industry happenings here, there and everywhereLetter to the EditorSuggesting how independent Service Dealers may get into TV26Book Reviews.11TV Service Outlook, by S. Young WhiteShowing how -the art will eventually become specialized in 313categories.15Build This Battery Salesman, by Rufus P. Turnerdetails of an instrument customers will appreciate.16Bad Acoustic' Cured Electrically, by Cuyler A. TuthillHow to modify existing sound installations.Video Amplifiers, by Samuel L. Marshall18Practical application's of video amplifiers.Circuit CourtRanger Model 118; Silvertone Models 7086 and 7103; Pilot20Model T-601 "Pilotuner.Shop NotesRCA model 66BX, tube replacement advice; Grantline models605-6 Series A, dial light replacement; Stewart -Warner model9003-B, audio Oscillation; Hum in Sets using Peanut Tubes; G -Emodels 41-2-3, increased sensitivity; Crosley models 88 TA-TC,21field strength meter; RCA models QU 56C -M, instability;Admiral model 7C73 (chassis 9A1), I -F slug information.Radio Trade Show New Products Literature Review, Part 2Resume of literature describing new products that is availableNew ProductsSANFORD L. CAHNThe supreme Court has ruled unconstitutional ordinances that ban the useof mobile sound systems on the basisthat such restrictions violate the privilege of free speech. The ruling does nottouch upon a municipality's right torequire permits (for a fee) authorizingthe use of a sound truck; but the decision implied that it is incumbent upon asound truck operator to use great restraint as to when and where he operateshis equipment so it cannot be placed inthe category of public nuisance.4service business.National Advertising Sales ManagerSound Trucks Permitted22223HARRY N. REIZESAdvertising ManagerBRANCH: J. C. GALLOWAY, 816 W. 5th St. , Los Angeles 13, Calif., Mutual 8335Jean M. WheelerCirculation ManagerDavid SaltmanAdv. Production ManagerRADIO SERVICE DEALER (title registered U. S. Pat. Off.) is published monthly at28 Renne Ave., Pittsfield, Mass. by the Cowan Publishing Corp. Executive & EditorialOffices, 342 Madison Avenue, New York City 17, New York. Subscription rates:-United States, U. S. Possessions and Canada, 2.00 for 1 year, 3.00 for 2 years;elsewhere 3.00 per year. Single copies: 25c Printed in U. S. A. Entered as SecondClass Matter at the Post Office at Pittsfield, Mass., under the Act of March 3, 1879. Allsubscribers should allow at least three weeks for change of address. Copyright, 1948,by Cowan Publishing Corp.RADIO SERVICE DEALER s- JULY, 1948

VOL. XVII (17)Should be over yourbench NOW !Factory -facts on FM as well as AM radioreceivers and allied equipment of 115manufacturers. Record changers and wirerecorders."clarified -schematics",Rider -Exclusivebreak -down every multiband job into individual diagrams of circuits as they existwith each turn of wave band or equipment switch.The separate "How It Works" book andthe Index comes with the Manual at no extra cost. Explains the theory of new radiocircuits and elaborates on the mechanicalinnovations of thesetscovered by theManual.1648 PAGES, PLUS "HOW IT WORKS"BOOK AND INDEX . . . . 15.00JUST OUTVOL. 1"We have neverseen anything to taketheir placeN. W. SCOTT, JR.SeteidManager of the Service Dept.BRITTS RADIO SERVICE, Orlando, Fla."We have depended upon the authorita-tive data in Rider Manuals for years.We have never seen anything to taketheir place, for the efficient, profitable,successful operation of a radio servicing business.THAT'S WHY WEALWAYS HAVE ACOMPLETE SET."RIDER/e'ee "'ejj44MANUALOVER 1400 PAGES(but the equivalentof 2000 pages)PLUS, 2 Separate Books, "HOW ITWORKS" and INDEX. Complete 15.00Circuit descriptions, adjustment of varioustrimmers, traps, transformers, etc., voltageand resistance readings, alignment instructions, parts lists, schematics, patterns, chas-sis views, wave forms. Everything neededon 1946-1947 television receivers (complete and kit) of 34 leading manufacturers.208 page "How It Works" book coversunderlying theory of television. Transmissionand reception, frequency standards, antennas, various portions of television receivers.Television"HOW IT WORKS"Available SeparatelyIf television is not yet in your area, it willbe soon. Here is theory you want. 2.70VOL. IRIDERpp MANUALOut in SeptemberThe first industry -wide service manual covering products of all leading manufacturersof PA amplifying systems, manufacturedsince 1938 to dote. Schematics, voltagedata, resistance values, capacity values,parts lists, etc. "HOW IT WORKS" explainstheory of various designs employed in different types of amplifier systems, the servicing of PA systems, using sine wave andsquare wave means of checking, methodsof rapidly locating faults. Everything youneed. Approx. 2000 Pages. . . 18.00*04,TOO --NEED ALL 17RIDER MANUALSVolume XVII . . . 15.008.40Volume XVIVolume XV18.00Volume XIV to VII(ea. vol.).15.00.11.00Volume VI .Abridged Manuals I to V(one von. 17.50Record Changers andRecorders9.00Master Index, coveringManuols,Vols. Ito XV1.50JOHN F. RIDER PUBLISHER, Inc., 404 Fourth Avenue; New York 16 .Y.C.CobleARLABNOTE: The Mallory Radio Service Encyclopedia, 6th Edition, makes reference to only one source of Radio Receiver Schematics-Rider Manuals.RADIO SERVICE DEALER JULY, 19483

Ilfral Ill I 1111kffA resume of Industry happenings here, there and everywhereTHE response to my May editorial,in which I said that I wasplanning a Fall tour for the purpose ofdelivering technical lectures to groupsof radio service dealers and technicians,is most gratifying. Here is the tentativespeaking -date schedule now contemplated:Cleveland, OhioMilwaukee, Wisc.Evansville, Ind.Minneapolis, Minn.St. Paul, Minn.Omaha, Nebra.Salt Lake City, UtahSan Francisco, Cal.Sept. 2nd""""""8th10th13th14th15th17th" 22nd" 25thLos Angeles, Cal." 27thSan Diego, Cal." 28thBurbank, Cal." 29thLong Beach, Cal.The night of Sept. 16th is still open asat this time it is not certain whether Iwill be at Denver, Col. or Kansas City,Mo., and arrangements for speaking inChicago on Sept. 9th are still only in thetentative stage. Complete details as towhere the meetings will be held andunder which Association's auspicesshould appear in this column next issue.Meanwhile, I would be remiss were Ito fail to acknowledge and thank themany Jobbers, Dealer and Servicemen'sAssociation who, without exception,have so wholeheartedly cooperated withme in arranging the schedule of speaking engagements. I also thank the manyradio manufacturing firms who arecooperating by assigning engineers tospeak on the various programs so thateach one will be quite diversified, informative and well-balanced.The TV Problem ClarifiesWhere ever TV sets have been sold inlarge numbers, and that means inevery city having TV outlets, thepublic has been delighted with theperformance of sets they bought but atthe same time dissatisfaction is rifebecause the installation firms have, as awhole, made a mess of matters. SomeTV buyers have had sets in theirhomes upwards of seven weeks awaitinga temporary or permanent installation.Were TV installations not restricted toso-called "factory -trained agencies" thiscondition would not exist. However, myeditorial on this subject (see page 3)indicates how the matter is well on itsway to clarification.by S. It. Cowandium and low price video sets are sellingwell but AM table and console set salesare off. In fact, many secondary brandreceivers are such a glut on the marketFor over eighteen months I havebattled alone trying to convince TVset makers to put TV installation service work on a free enterprise basis.I have contended that there is nomystery to TV and FM problems if anytechnician assiduously studies the subject and reads "R SD" regularly. Now,to bear out this contention, a contem-porary publication (which caters primarily to radio retailers) in its Juneissue naively admits that the most experienced TV installation and servicecompanies concede that each and everycase requires "Trial and Error" treatment.Service AssociationsFrom all parts of the country comereports that groups of technicians whothat they can't be disposed of at anyPublic address equipment salesare holding up well, for during electionprice.years there is generally a P -A boom.Mobile units are in particularly greatMany service dealers aredemand.selling and renting P -A systems forcampaign purposes, and in conjunctionwith the basic P -A equipment are findingit easy to sell a wire or tape recorder sothat the operator can make a referencerecording of the proceedings.Radio service work has not taperedoff to any extent, and in fact, seems tobe heading towards a new high level inmany communities. The large volumeof work available is offset, however, bythe fact that many service dealers andtechnicians are not charging a highenough per -hour rate scale for theirhave organized to improve their ownliving as well as professional standardsare finding the effort extremely worth-New York City's ARSNY,although less than eight months old,while.already has built up a membershipexceeding 550, and during the pastmonth has been favored by technicaltalks by such authorities as John F.Rider, famous Manual Publisher andAl Saunders who prepared HowardSams' TV course. In fact, ARSNYpresented Rider with a plaque inrecognition of his 20 year's of service onbehalf of the servicing profession whenhe sponsored a meeting of over 1200technicians. ARSNY, like other well established associations, is getting freespot -announcements on several N. Y.radio stations and the public is avidlyresponsive by favoring ARSNY members with its service work. To date theGrievance Committee of ARSNY hasfound it necessary in only one instanceto prosecute a serviceman who would notvoluntarily render proper and equitableservice to a customer. The bug -a -boothat radio servicemen are not honest isquickly being dissipated by Associationactivities everywhere.Set Sales Are Down, Servicing UpIn all major marketing centers dealersreport a sharp drop in the sale of radioreceivers and electrical appliances. Me-John F. Rider, publisher, receiving plaquefrom Max Liebowitz, President of Associated Radio Servicemen of New York inrecognition of his 20 years of service onbehalf of the servicing profession.RADIO SERVICE DEALER s JULY, 1948

KNOVVr.TUBESAREIllllllllllllllllllllllllIIIIItauA smart serviceman, you are mightycareful to pick the best in tubes. That's onlynatural. You have a reputation to protect. Justso does Motorola guard jealously. its wellearned reputation as tops in auto radio byselecting only the best components.Ever notice how often you find Hytrontubes in Motorola auto sets? To rate as one ofMotorola's major tube suppliers, Hytron justnaturally makes tubes a lot better than good.Take a tip from leading radio set manufacturers likeMotorola. They make it their business to know and usethe best in tubes. You, too, can bid goodbye to your tubetroubles, and safeguard your reputation by "going steady"with Hytron. 00. 1'tzt*Win These Monthly Prizes!SERVICEFIRST PRIZE, SEPT.FIRST PRIZE, JULYHickok 156A IndicatingTraceometer.Jackson 641 UniversalSignal Generator.FIRST PRIZE,AUG.McMurdo Silver 900A "Vomax," 904C/R Tester, and 905A "Sparx."Want one of these deluxe first prizes? Perhaps a 200 U. S. Savings Bond grand prize? Or one offour 50 and four 25 U. S. Savings Bond secondand third prizes? Try your hand at any or all ofHytron's monthly contests exclusively for radioservicemen. It's easy. Here's how. Get entry blankFIRST PRIZE, OCT.Weston 769 H -FElectronic Analyzer.with complete details from your Hytron jobber, orwrite us. Describe your proposal for a simple,economical shop tool like the Hytron Tube Tapperor Miniature Pin Straighteners. Mail entry toHytron Contest Editor. Then hold your breath.The finger of the judges may point at you.vizelrSPECIALISTS IN RADIO RECEIVING TUBES SINCE 1921NEW 9 -PINMiniature Pin Straightener%.m.14.-twowat.s towMAIN OFFICE: SALEM, MASSACHUSETTSRADIO SERVICE DEALER JULY, 1948Only 49i at Hytron jobbers5

labor. Their mistaken notion that thepublic will not pay a reasonably highfee to servicemen causes many technicians to quote prices that are too low,and consequently, in such cases, theservicer takes a loss. The only adviceone can give is this: make a genuinestudy of your costs and required earnings, and then charge fees accordingly.We have assigned a group of cost -accounting experts to work on this subject and hope to be able to publish theirrecommendations in an early issue.FCC License AdvisableA Mr. Edwin Crelli of Johnstown, Pa.THESE new Racon models mark another step forward inA pioneer in "scientificallyspeaker and horn design.designed" audio units over twenty years ago, Racon is still makinghistory in this field.Do not be misled by the fact that speakers and horns ofvarious makes look alike.Under the surface of any Racon unitthere are "differences"-small physically but bigfromthestandpoint of Performance!Whatever the application, you can be sure that these subtledifferences-built into Racon units by experienced audioengineers-will give you all-around performance and service ofoutstanding superiority.PERMANENT MAGNET HIGH FREQUENCY SPEAKERAn efficient precision built Speaker, to meet thelatest requirements for wide range reproduction. Designed to cover the frequency band up to 12,000 cycles.Supplied with horn having a low cut-off at 750 cycles.When used in conjunction with a suitable low fre-quency speaker and cross -over network will give audioreproduction at a new high quality levelVoice coilimpedance 15 ohms.TWO -CELL HIGH FREQUENCY HORNLatest type of cellular horn with two cells,specially designed for flush mounting in anycabinet, giving distribution angle of 120 horizontal and 60 vertical. Has a 7/8-18 threadthroat connection for a Racon standard highscribers who have written recently tocomplain that radio technicians areunderpaid. He states that "shoemakersearn from 5 to 6 an hour whereasradiomen seem to be satisfied with muchless." I personally don't agree thatservicemen "are satisfied" to earn less,but, as stated above, feel they don'tknow how to go about pricing theirservices so they earn more.The question of holding an FCClicense enters the picture and can effecta technician's earning capacity.Throughout the country police and firedepartments, trucking and taxi firms,industrial and educational organizationsare utilizing radio -communications andTV gear to an ever greater extent. Withthe advent of Citizens Radio, undoubtedly the average radio technicianwill find himself more and more involvedin servicing and maintaining transceiverapparatus, and to do so properly, suchtechnicians should hold at least a Class2 FCC ticket.frequency unit.TWO NEW TYPES OF FILTER CROSS -OVER NETWORKS,COMPLETELY ENCLOSED, EASILY MOUNTED1. A simple Capacitive filter network with cross -over at1500 cycles.2. Resistive capacitive filter network with a cross -over at1500 cycles and permitting balancing of high response tolow.NEW SMALL RE-ENTRANT HORNSIn time it might bemandatory.Just as most cities require thatelectricians be licensed, so must Iadvocate that all radio technicians takethe required study course to qualify forand obtain their FCC operator's license.Holding such a qualification would enhance the technician's position, give himprestige, and permit the charging of ahigher rate scale for services rendered.In addition, broadcast, FM and TVExtremely efficient for factory inter-com and pagingsystems; for sound trucks, R. R. yards and all other industrial installations where high noise levels are prevalent.stations around the country are short oftechnical man -power which slack mostradio technicians could take up, at leastmodels-typeon a part-time basis, if they preparedWatertight, corrosion -proof, easily installed. Two newwith Baby Unit,RE -15, completehandles 25 watts, covers 300-6000 cps; type RE -12, complete with Dwarf Unit, handles 10 watts, has fre. responseof 400-800 cps.Write for catalog describing complete line ofRacon Horns, Speakers, Units, Accessories, etc.RACON ELECTRIC CO., INC.52 EAST 19th STREETNEW YORK 3, N. Y.RACON6is typical of the many "RSD" sub-themselves accordingly.2eite4 ta ate edita4Mr. S. R. Cowan, PublisherRadio Service Dealer MagazineNew York 17, New YorkDear Mr. Cowan:"I read with interest the pre -publi-cation draft of the television servicepolicy editorial which you contem-plate running in the July issue ofRadio Service Dealer."This editorial is well written andnicely presented. There are, however,RADIO SERVICE DEALER JULY, 1948

NEW UNITS!NEW MARKETS!NEW SALES!for thePICKUP (ARM AND CARTRIDGE)No. UPA-002VARIABLE RELUCTANCE CARTRIDGEPrIIESE three new General Electric units open up greaterI and greater sales possibilities for the Variable ReluctanceCartridge.Tailored for this fast-moving unit, they fit a ready-mademarket. Installation problems are simplified, labor is reducedto a minimum, and performance is improved.Order today-get sales rolling.No. UPA-002For 10 and 12 inch recordsPICKUP (ARM AND CARTRIDGE)This inexpensive Pickup has an immediate appeal for theserviceman, high fidelity enthusiast and experimenters-infact, everyone who owns a record player.This arm can be used with any record player without automatic changer and provides excellent response with absenceof undesirable resonance.A mounting template is supplied with each Tone Arm.TRANSCRIPTION ARMTYPE FA -21-ATRANSCRIPTION ARM . TYPE FA -21-AFor Professional UseBroadcasters, sound laboratories, recording studios andwired music services will welcome this unit to simplifyturntable problems.It's easy on the operators-easy to spot in correct grooveno instability worries.PHONO PREAMPLIFIER .No. UPX-003-with RECTIFIER(For 117 volts, 60 cycle)This self-contained preamplifier solves a tricky, laborious,installation problem for the busy serviceman. Installationscan be made quickly, easily, profitably. The unit is ready tooperate when attached to the set-just plug it into the nearest available outlet.For complete information on these three unitswrite: General Electric Company, ElectronicsPark, Syracuse, New York.PHONE PREAMPLIFIER169-G7GENERALNo. UPX-003ELECTRICRADIO SERVICE DEALER JULY, 19487

22 MILLION PHILCO RADIOS!. Yes, by far, here is your greatest market forTubes, Batteries, Parts and Accessory Products!Cash in on America's preference for Philco. Sell genuinePhilco accessories and replacement parts. They are preferred by Philco owners . are known and accepted byall radio owners for dependable quality and long life.The complete Philco line of tubes, batteries, parts and acces-sories-engineered for all radio makes and models-enablesyou to concentrate on this ONE PREFERRED BRAND, avoidduplicate stocks and overlapping lines, speed turnover, makemore money. Get complete facts from your Philco Distributor.8RADIO SERVICE DEALER . JULY, 1948

RADIO SERVICE DEALER JULY, 19489

one or two points which you may wantto reconsider before putting it on theReference is made to Paragraph 3 in which it was pointed outthat service organizations should actat once to protect their own and thepublic's equity in the TV installationand sales business. Actually I wasprimarily concerned with the actionon the part of the independent serviceorganization in protecting his ownequity in the installation and servicebusiness as that equity was beingcompressed as the result of manufacturers' use of so-called exclusivepress.The NEW, PROFIT -MAKING 9/z6r/ei7crWEBSTER-CHICAGOWIRE RECORDERappointees in the past 12 to 18 months.There would not in any event bepublic equity in this activity and youmay deem it desirable to revise thestandpoint."The reason for the suggestion thatthe service fraternity promulgatetheir own plan of "radio serviceinsurance" may not be evident to thereader of the editorial. In my opinionthis is a very vital point that will convince the set manufacturer that theindependent service man is willing tooffer his services to the public on amore tangible pricing basis than hasbeen the case heretofore."As you undoubtedly personallyappreciate, radio service insurancecan only be 'offered by an organizationthat is run efficiently and in accordance with sound business practices.Radio service insurance can be themeans of eliminating certain malpractices that have from time to timecaused the public to look with question upon the integrity of the profession that should be very highlyregarded in view of the technical skillthat is required.L New Push Button ControlsT Give Greater Flexibilityand Simplify OperationHere's how to make fast profits! Show . suggest . . installthe new, simplified Model 78 Webster -Chicago wire recording unit. It is built around the famous Model 79 wire transporting mechanism and has a built-in pre -amplifier, inter stage amplifier and oscillator. The push button control meanseasy operation, better recording and flexibility in handling.The recording level meter provides easy, accurate recordingvolume control. Comes complete withmicrophone, 15 minute spool of wireand necessary cords for radio connection with easy to follow instructions.Size 11" x 11%" x 5%".See Your Webster -Chicago DistributorWEBSTERNCHICAGOFAMOUS FOR RECORD CHANGERS AND NYLON PHONOGRAPH NEEDLES5610 BLOOMINGDALE AVENUE CHICAGO 39, ILLINOIS"I suggest you emphasize that theoffer of radio service insurance plansby members of the independent servicing fraternity is a very urgent 'must'if they are to reverse the trend of themanufacturer's use of 'exclusive appointees.' The public has gotten tolike the idea of the insurance plannow being offered by the set manufacturer and if a return to the RMAstandard 90 day warranty is to beaccomplished, the servicing fraternitymust immediately offer an optionalinsurance plan of their own so thatthe purchaser of a television receivercould obtain service protection for aperiod of a year. The absence of thisoption could create a sales problemfor the set manufacturer who wishesto dispense with the exclusive ap-pointee arrangement."Last but not least is the manner inwhich these radio service insuranceplans are to be promulgated. The onlylogical basis for pricing the plan is indirect proportion to the complexity ofthe equipment which can be bestdetermined by a numerical count ofits stages. For example, the moresimply constructed television receiverutilizing the inter -carrier method ofextracting sound intelligence wouldhave considerably fewer stages thanthe conventional type separate soundpicture channel job. One would beobviously less complex than the otherand hence the insurance fee shoulddiffer proportionally. Thus, serviceinsurance could be offered at one ratefor a 20 stage receiver and another fora 24 stage and in addition the ratemight be based on a 3, 6 or 9 monthperiod. My personal preference is forthe 3 month package."I hope your editorial attracts wide -10RADIO SERVICE DEALER JULY, 1948

spread attention amongst radio service men and that they become cogniz-ant of the fact that 'this is the timefor decision' if they are to retain theircompetitive position against the manufacturer's type service plans and useof exclusive appointees that have beenin use since the post war productionof television got under way."Truly yours,Stewart -Warner Corp.N. J. Cooper, Service ManagerRadio DivisionBIGGEST VALUES in TELEVISION!BOOS REVIEWSHow it Works (Supplement to RiderLarge -Image, Direct -View TV Kits at Low Cost!Kits Engineered for EASE 'of ASSEMBLY and Top Performance.Cabinets designed and jbuilt for Beauty, Utility, Durability.NO TECHNICAL KNOWLEDGE REQUIRED for ASSEMBLY.Television Manual Vol. I) Published byJohn F. Rider, Publisher, Inc., 404Fourth Avenue, N. Y. 16, N. Y. 203pages 8% x 11 inches. Price 2.70.The purpose of this book is to developin the radio technician a familiaritywith television theory and circuitswhich when augmented by outsidepractice should enable an experiencedradioman to become a good televisiontechnician.The various chapters of this bookwere assigned to different members ofthe Rider staff. This has in no wayMODEL 10BL Gives 115 Sq. In. Picturedetracted from the continuity of thebook, and has rather enhanced itsvalue because of the "new approach,"and the vigorous manner in which eachchapter is presented. Contained withinits covers we find the contents arrangedin conventional fashion, starting with achapter on general aspects of television,and ending with one on alignment and00000servicing.The subject matter covered is fairlyReferences to current TVreceivers ties in with theoretical explanations as well as practical applications. The net result is a valuable addition to the all too meager number ofbooks on TV that are available at thecomplete.Consolette Model 7CLRoto-Table for full 180 VisibilityTRANSVISION manufactures the most extensive line of high quality Television Kits, Cabi-nets. and Components. Models illustrated and listed here are only representative ofTransvision's leading values. See your distributor.MODEL 103L, TV/FM Kit, gives 115 sq. in. picture, complete FMRadio; receives all channels; streamlined cabinet .NET 299.00Roto-Table for Model 10BL, gives full 180 visibility. Net 24.95MODEL 7CL, TV Kit, gives 60 sq. in. picture; consolette cabinet.complete with Roto-Table; streamlined designNet 199.00MODEL 7BL, same as 7CL except that it is a table modelpresent.Essentials of Radio by Morris Slurzberg and William Osterheld. Published1948 by McGraw-Hill Book Company,Inc., 330 W. 42nd St., N. Y. 18, N. Y.710

Guide is free. The Vibrator Data Book is 1.00-from your distributor or by mail. Equally Matched There's no place for a "weight advantage" in the assembly of a vibrator. Unless every part is accu-rately matched to every other part the performance of the vibrator will be erratic. Mallory vibrator parts are measured to a minute