Dynaco Transformers 电路图.pdf
T0668LICENSED UNDER U.S.PATENTNO.2.85.408 IJIYIfaCDiNc.3060JeffersonSt.Philadelphia.Pa.19121U.S.A. RadioFans.CN 收音机爱 好者资料库 SUPERFIDELITY OUTPUTTRANSFORMERS ThenewlineofDYNACOoutputtransformersincorpor- atesthefirstbasicadvanceinoutputtransformerdesign sincetheintroductionofinterleavedwindings.All DYNACOmodelsfeaturepara-coupledwindings,a designbyDavidHofleronwhichpatentsarepending. Thisnovelarrangementprovidesanaccuratelybalanced coilwithtightcouplingbetweenthevarioussectionsand achoiceofparameterswhichfurnishsuperiorqualityat moderatecost. Thelowdistortionwhichresultsfromthe para-coupleddesigngivesgreaterdefinitionofmusical detail-analogoustothewayinwhichcomplexcoupling oflenselementscanprovidegreaterresolutionofphoto- graphicdetail. ThebasicaiminthedesignofDYNACOtransformers wastoprovidethefinestpossibleperformanceunder actualaudiooperatingconditionsaswellasunder steadystatelaboratorytestconditions.Thisgoalwas achievedbybuildingintothetransformersalargemar- ginofperformancecapabilities,overthatnormally expectedinanoutputtransformer.Oneresultafthis policyisthatthedesignisnotcriticalontubebalance, andcircuitscanbesimplifiedandmaintenancemini- mizedbyomissionofcomponentswhichoreusedsolely forthepurposeofbalancingcurrentsintheoutput transformer. Recognitionoftheimportantfactthatoutputtransform ersareintendedtooperatewithloudspeakerloads ratherthanresistiveloadsaloneledtodesignfeatures whichpreservethequalityofperformanceevenwhen theloadimpedanceshifts such ashappensattheends oftheaudiospectrumwithloudspeakerloads.Thesub stantialreserveofpowerhandlingcapabilitywhichis builtintoeveryDYNACOSuper-Fidelityoutputtrans- formerpermitsfullundislorledpowertransmissionat frequencyextremes.Mostbettergradetransformerscan deliverareasonableamountofpowerinthemiddleof theaudioband.Unfortunatelyhowever,in most unitsfhe distortionathighlevelsincreasesharplyattheendsof theband.ThisisnottrueforDYNACOtransformerssince thepara-coupledarrangementreducesmiddleandhigh frequencydistortion,whilea massivecoreofthingauge grainorientedsteelprovidesdistortionless transmission ofhighlevel,lowfrequencysignalcomponents. Modernhighfidelityamplifiercircuitsincorporatesub stantialproportionsofnegativefeedback,primarilyto reducedistortiontoextremelylowlevels.However,fhere isapenaltywhichisincurredintheuseoflargeamounts offeedback-problemsofinstabilityareintroduced,and alargeportoftheseproblemsaredueto thedetrimen- to Iphasecharacteristicsoftheoutputtransformerused. Amplifierswhichdonothavesufficientmarginofstabil. ityunderfeedbackconditionstendtogelbloopyand muddyatlowfrequenciesandharshandstridentathigh frequencies.Theremedyrequirescloseconlrolofthe amplifierandIransformerphasecharacteristicsevenat frequenciesforremovedfromIheaudioband. Advancedpulsetechniqueshavebeenincorporatedinlo thedesignandproductionofDYNACOSuper-Fidelity Iransformers tomakethephasecharacteristicssuitable foramplifierswithhighproportionsoffeedback.The gaininmarginofstabilitywhichaccruesfromthisdesign techniquemakesanaudibleimprovementinlistening quality.The best testforinherentstabilityunderfeed- backconditionsistheuseofthesquarewavetest-both onIhetransformeraloneandonthecompleteampl:fier withloudspeakerload.ThesuperiorityofDYNACO transformersisreadilyconfirmedinthissquarewave testbynotingthestraightsidesandflattopofthe waveformandtheabsenceofripplesandspikes, even athighfrequencies. DYNACOSuper-Fidelitytransformersarebuilttogive consistent,longlastingperformance.Suchfeoturesas 3000voltinsulation,vacuumimpregnation,hightemper- aturepottingcompound,andrigorousproductiontesting protecttheperformanceabtainedbyuniquedesignand precisionwinding.Thedesign,thematerials,andthe fabricationarethefinestavailable;andtheyprovide thefinestperformance. CIRCUITS FORDYNACOTRANSFORMERS ThehighperformancecapabilitiesofDYNACOSuper- Fidelitytransformerswillimproveanycircuitinwhich thesetransformersareused. As ageneralruletheycan beinsertedinanyhighqualitycircuitconfigurationin eludingWilliamson,ultralinear,multi-Ioop,or anyotherwithgratifyingimprovementinamplifier stabilityanddistortioncharacteristics.However,the benefitsavailablefromagiventransformerarebounded bythecircuitinwhichitisused.Therefore,werecom- mendsomespecificcircuitarrangementswhichhave beencarefullydesignedandtestedtoinsuremaximum usersatisfaction. The circuitsshownaresuggestedforthosewhoroll Iheirown,eitherincompleteamplifierconstructionor inmodernizationandconversionofolderequipmentor moderate-fidelitycommercialequipment. TheDYNACOcircuit,as used intheDYNAKITMarkill, wasdesignedtomatchtheoutstandingcharacteristics oftheA431transformer.Thesimplicity,stability,and qualityofthiscircuitareunequalledbyanyregardless ofcomplexityorcost. ThethousandsofpeoplewhohaveWilliamsontype amplifiers,inanyofthepopularversions,connow modernizethemtoimprovetheamplifierstabilitychar- acteristicsandtoincreasetheirpoweroutputtoover 50 wattsasshowninfigu,e2. Thismodernizationandcon version, usingtheDYNACOA-431transformer,makes animprovementinqualitywhichisaudibleeventothe untrainedearsincethereisgreatercleanlinessand smoothnessofthesound. Figure3illustratesalowpowercircuit(12watts01less than1%1M.distortion)whi<hissimilartothatused in manyofthemediumpricedcommercialamplifiers.Either El-84sortubesofthe6V6and6AQ5typecanbeused inthisconfigurationwiththeA-410transformer.The use ofthissuper.fidelitytransformerincommercialgrade equipmenlmakesasubstantialimprovementinIransient response aswellasdrasticallyloweringthedistorlion. Mostcommercialamplifierscanbegreallyimproved merelybydirectsubstitutionoftheA-410foramplifiers ofthe6V6IypeortheA-420foramplifiersofthe5BB1, 6L6,andKT-66typewithoutanyothercircuitchanges_ The120watlA-441Iransformerisdesignedspecifically tobe used inapplicationsrequiringatightlycoupled tertiarywindingforscreenfeedback,cathodelooding, orforbalancedfeedback10earlierstages.Wilh6550 tubesusing600platevolts,350screen volts,and35 voltsoffixedbias,itispractical10get100wattsof cleonoutputwithsuperblisteningqualily.Theoutput stagecanbereadilydrivenfromWilliamson.lypecir. cuitsofthemodernizedtype. RadioFans.CN 收音机爱 好者资料库 FIGURE 16.n. 8JL 4-,- COM. KT88 5 o co <D o Q o o o o o r-: <t g6.3V PREAMP PWR. 117V 60rv 3A P782 6800 :Ef120MA r+-1K1-_n/IlOIt1/-rww-.J18n.,O,O. O-, GR-; 480V MATCHED PAIRS QSlPRINTED CIRCUIT EYELET DYNAKIT MARKlIT60WATT POWERAMPLIFIER FIGURE2 6CA7/EL34 (2) s7 .;.152 _2_0M_D-_-_-_-rlBIII.:1(loXHrr_-j 65N7 I-J-,-,nnnnr-or-r-4-50J NOT- I UNoOERUNE.DpA.nlSfdHESSENTlAt(HANGe.S.OHIE.R. PARTSMAYIADIRf-TVALUESDE.PENDING ONORIGINALAIRA.N6EMNTllSED.11-H. Ul o . o o 100 ow r ZOWP _1 400 - lOWPOWER HIGH QUALITY CIRCUIT WHICHCANBEUSEDTO IMPROVETHEQUALITY OF COMMERCIALAMPLIFIERS FIGURE4 IOOK-IW18K-IW 1M 10K .0 rJll,_.T 400-0-400 250MA DYNACO A420 r-+_16 1l18 680 IW t-+-LCOM +0 I MATCHED1% IMPROVEDMUllARD30WATTAMPLIFIER USINGDYNACOA-420TRANSFORMER .:6.3 Boo IW i uR. R PC-706 DYNACO A-4SI 480 *Matched oChangerequiredwhenusing DYNACOprintedcircuitassembly COM DYNACO120WATTAMPLIFIERUSINGDYNACOA-451TRANSFORMER 221( TOBTO6 C35RED I,=-2_4 -,P-t3C70OJ.9.-O -20 I?II AA70 ijj -oYEll6 .OR8 BRN 4 BlKCOM 9LU-WH EL34 El34 1K 47 620 I I I 390PF1: +-+-.-II 11(I 4701( *MATCHEDPAIRS 3I IPA.135 IDYNACOI I_PC4I L_J2A 117VG 1-, I8I II II II II I3301(1.5M47K*I I10I I I270K*1, IIII 2701(*I I 4f;5 EYELETSONCIRCUITBOARO. POWER TAKEOFF SOCKET DYNAKITMARKli40WATTPOWERAMPLIFIER *MATCHED 1% oPREAMPPOWERTAKEOFFPOINTS PA-060 D3A DYNAKITSTEREO70DUAL35WATTPOWERAMPLIFIER COM 16-L-l-rDR-lIFo;:-:;:;:;:=i(III 8- 4.1. l( Q C PC-6PC-5 AUDIO OUT OK AUDIO IOUT 621l1lmnlclcrs.1.lICI1IIX!II<1lng PA211 L-+-.L-.e+-f:-_l_-=-l - i I I I I I I I I PS IIrVA,-(-l BU< GREEN LEFT I( 1000 M.iooo.ooo PF.MtCRClMICROFAA.DS .-n:l,. 10 rAPE IN SPARE-,-, ,.-rl, T,/l,PE:):=;=0i.-l our f-.-. TAPE IN_-_-_I_ SPAE(j-r-, NPX-.-t- AMII_C1JIT) or6CA7s inpowe,sup10 200watts Net Price $20.9552695539.95$59.95$59.95$26.95 (slightlyhigher $44.95 intheWesl) $44.95 AllunitshavelapsonprimarywindingsexceplA441whichhastightlycoupledlertiarywinding. Allunilsarefurnishedinheavygougesteelconswith12colorcodedleadsandsteelmounting studswithmountinghardwa.re. UnitsareconservalivelydesignedandcanhandleIwicethedccurrentofthelubetypesrecom mendedloruse.Neilheraverloodsnoranyamountofunbalancedoperotiorwillharmthetrons- formers.Foroplimumlowdislortionreproduction,thedcbalanceshouldbekeptwithin10%. P-782powertransformerasusedinDynokitMorkID410Q55-410,200mo;5v,3a;6.3v,40.Weight9Ibs; size4x4J.1x4high;netprjce$20.00.(Furnishedonlyinverticalmountingendshell construction). PC706powertronslormerforusewi thA-451 in120wattomplifiercircuit:4100-55-410,400ma;5v,6a; 6.3v,8a.Weighl14Ibs.Netprice$33.00.(Furn;shedinverlicolendshellsonly). - C-354choke(200molNetprice$2.80 C-492choke(400molNetprice $6.60 5oC1;H.(1J1tJ8E 2It (on(.A1HOOiEU B PlE ,ulE-2 MODELSA-410,A-420, A-431,A-451andA-470 (BROWNLEADIS411OUTPUT) (WHITELEADIS70V OUTPUTONA-431-70l PlAlt 1uBfI Oll:8n alN40. . -c MODU/10. OUTPUTTRANSFORMER(OLORCODING .02 C;ltm(CTIONSTUOASPtCI.LItJPUT RIA.A5TAAPWO,l10NO.t TA.4P0,9100.12 MICROPHO(_STRP3rrAO,J.PIHNTOCIRCuITHLT J, 2OO 1-_-r_O;.-.-_-+_f-+-_-f-f_O-r-r-r_OO,.-.-t- 20Otoo.3tiORT<P.,eL-LtoooO ),1_.0l. _;1?AX7MEG. 3 1 -100: 1 T1 VOL.UME: r,-ONTROlJ-1/2I. .0, ;0to1 pc Oo oc oc ( .-.,.-.,.-.-r-i-:.-, (,<,Or JHyf-.,10 <4n <IIo_o V,-: o0cl POIiO!.-:;=t:=J LQ-L(VEL. DYNAKITPAM-lPREAMPLIFIER STEREO70PAS-3XMARKillPAM-lMARKN printedinU.S.A. . tJIYIIaCD;11C_3060JeffersonSt.Philadelphia. Pa.19121U.S.A.
