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1 !Thankstoon-linecurator:KennethKuhnforsu pplyingandscanningthisvintagedocument.,. (j~~AMPUFIER========== (-6dB,RIAA,+6dB) (FLAT,BOOST).. , (EuropeanUnits)..E;DeckWiring(SeeSection sVI,A,B,C,andD.) . ,instudios, (phonographpickups,tapedecks,AMandFMtunn ers) , , ,installandwireprintedcircuitconnectorsi nthedeck,drillfrontorrearpanelholesasreq uired, ,theresidualhumiswellbelowthermalnoise(w hichitselfhasbeenminimizedbyoptimuminput stagedesign). , ,overloadproducesnolongtimeconstanttrans ients; , ,andactivefiltersinthemixingandcontrolbo ard, ,orrectificationof, , , , !III-1010~o100~oo1000~Ilrr~I1001 FREQUENCYII~I"h!I~~T,OUT:I'i~o+l-J+ ++1"'-N~-+----==t"'+-++----1I--+-+++-""' +-+-I_+____1~I!)
2 1i! :II'\~~I~-51fI I~~!\..-IIIi:iFrequencyResponse1\..m\~-1 01+11/-'-+1-+1+----+---+----+-++----1-+- +-+-Hf~~I~-IiI\! \-1~t--+-+++_-+--+----+-++-_I1__+-+_+_1_ +_\ +___+_I_1_+____1: Iii\Ir\~< , , :84dbbelowonevoltoutputHUMANDNOISEHARMONICDISTORTIONSPEAKERZCONTINUOUS*AUDIOPEAK+116::::::36W::::::90W+18::::::50W::::::160W+4**::::::80 WINPUTVOLTAGEFORFULLOUTPUTT uner,Tape,Aux1,Aux2:~ :~5mvrmsINPUTIMPEDANCET uner,Tape,Aux1,Aux2:100 (Cont'd.) >18dB/octavewithcomerat5,8, and8 :Dualprecisionattenuator,60dBrange, :TUNER,TAPE,PHONO,AUX1, :STEREO-DIR(ect),REV(erse),L,RMONO-DUAL, L,RBASS:FLAT,BOOSTR esponse:RIAA,+6 dB,- 6 "(425mm)wide, "(127mm)high, "(278mm)deepbehindpanel.
3 *Bothchannelsoperatingsimultaneouslyatma ximumoutput.** 10%,50-60Hz,20 Wstandbypower,135 Watfulloutputinto16n(bothchannels). "normal" "left" "right" :TUNERTAPEA cceptsinputatlinelevel(0dBm)fromFM,AM, (0dBm) (STEREO side)orboth(MONO side) , highfrequencycut-offat5kHz, highfrequencycut-offat8kHzwitha , (orscarcelyperceptible) ,thenuisanceandhazardofanimproperlyset2- 1 FrontPanelControlsbalancecontrolareelimi nated.( ,theperfectionistmaywanttotesthiscompone ntsandintroduceappropriatelossintothe"ho t"side.) (-6dB,RIAA,+6dB)BelowtheINPUT selectorcontrol,andeffec-tiveonlyinthePH ONO positionofthatcontrol,a (Nor-mal)position, ,thehighfrequencyresponseisdroppedby6dB, whileintherightposition, (suchasDeutscheGramophone)conscientiousl yadheretoRIAA spec-ifications,whileothers(namessupplie donrequest) , +6dBpositionbetterinthemajorityofcases,y ourspeakers(oryourears) (FLAT,BOOST) ,theswitchraisestheresponseat6 ,approximatecompensationisprovidedforthe usuallow-endroll-offofgoodspeakers.
4 (Twopolesat40-50Hz).Ifyouarefortunateeno ughtohaveanoverdampedpairofwooferswithre alpolesat80 Hzand20Hz(suchasLE-15A'sorALTEC411-A' ), , ,the"LOW"sideofeachinputisnotgroundedins idetheamplifierandTHESEMUSTNOTBEGROUNDED ORCONNECTEDTOGETHER externally.(SeeSectionV, )Ifcoaxialorshieldedwiresareusedforeachc hannel, , , , (includingatorinsidepickup). 'shieldmustnotmakecontactwithanyTOCHASSI SOfTURNTABLEORCHANGER leadconnectingpickuptoamplifier(includin ginnershields).Insomelocationstheoutersh ieldmaynotbenecessary;insuchcases,turnta bleorchangerchassisshouldbeconnectedtoam plifierchassis(groundterminalonrear)with aseparatewire, ,motors, , , , givenpickup, :r\L6~\R1=_0_x10-100R ,Roispickupinternalresistanceinohms,andR ,seeSectionV, , , , ,theanglebetweenthelinesofsighttothetwos peakersshouldbeabout150to450, ~~~~ ,FREQUENCYANDLINEFUSINGU nlessspecificallytaggedotherwise, (Anexternal230-115 Vstep-downtransformermaybeused.)
5 , 10%ofthenominal(115 Vor230V) ,a separ-ategroundmaybeneededtogetridofhumo nphono, (EuropeanUnits)UnitsshippedtoEurope(andi na fewcaseswithintheUnitedStates)areequippe dwith115 , , , , ;for230V, ,caremustbetakentoinsurethatwindingsarec onnectedinan"aidingsense"(instantan-eous fluxproducedbybothwindingsmusthavethesam epolarity).Thelinefusemustbechangedwhenc hangingthelinevoltage( ;.8ampfor230V). ,carefulattentionshouldbepaidtotheoutlin edrawingshowninSect~opIII, ,especiallythepowersupplycapacitors,areq uitelarge, ,J.,itwillbeseenthatoverallfrontpanelhei ghtis5", ",andthatthesidegussets' " "high,iftheamplifiercanbetippedslightlya sitis ,4", ,itmaybeassembledasoutlinedbelow.
6 (SeeSectionIII, ~rpictureofassembledenclosure.)Theenclos urekitconsistsofthefollowing:Twowoodside panels(onerightandoneleft). ,simpleandbeautifulfinishwhichcanbedoneb ymostanyoneanywhereisanoilfinish, (onebrandis Watco).Ifahigh-glossfinishisdesired, , , , "DUAL". ,theabovetestisdifficult,' ,ontheaverage,onechannelseemslouderthant heother, , ,theweakonemaybedefective.( ) (ex-ample:Q3andQ5)withconstantcurrentsup plies(example:Q1andQ7).Thiscombinationpr ovidesveryhighinputimpedance, (example:C1,R1,C3,R7,Q3,Q5). ,suchasQ3orCR8orsuchasCR1,CR2,CR5,etc., , ,anda (about10Kn ) (normallytheoutershieldsofcoaxiallines) (0dBm) +Ro= , 6dBvariationofhighendresponse, ,togetherwiththeselfinductanceofthepicku p, ,andifRistheinputresistancetothepre-ampw erequirethatThelowendbassboostoftheRIAA charac-teristicbelow500 HzisprovidedbyC12andR3+R4+R5+ , ,twoofthepolesbeingprovidedbytheinputRCn et-worksandtheremainingpoles(andzeros) (Ifyounoticeanyhum,it'sfromcouplingdirec tlytothecartridge.)
7 Potentiometersareprovidedtosupplythebase currentsoftheinputemitterfollowersandthe rebyenablethevoltagesatterminals5,4, cascadedcomplementaryemitterfollowercom- prisingtransistorsQ12*andQ13*, *andR6*andbycurrentsfromcurrentsourceQ8f lowingthroughCR7,CR9,R22, *andCR2*shuntR5*andR6* *protectstheoutputstagesfromtheeffectsof capacitivecableloadsatveryhighfrequencie swhileR8* ,CRll, * , differentialpair,QlandQ2, (>100dB). ,whereC6beginstoshuntR16producinga highendcut-offintheamplifierandreducingt heloopgaincutoffrateto6 ,C4,Rll, poleat16 Hzanda ,tocompensateforthelowendroll-offofmostl oudspeakers." , (volumecontrolatmini-mum)andR4withtheinp utterminalsopen(orwiththevolumecontrolat maximum)togivezerovoltsoutoftheamplifier ,thisconditionwillholdforanyimpedancethe amplifierfaces(anyvolumecontrolsetting).
8 (50V,40V,20 VandlOY) ( 40V)isrectifiedbydiodesCRl,CR2,CR3, ,especiallyunderload, (You'llruinyourscrewdriver.)The+50 Vsuppliesarereally10 Vsuppliesfloatedonthe+ + 20 Vsuppliesobtainedfromthecascadedemitterf ollowersQ3-Q5, ,C5,R13andR15,C7andtransistorQ3forthe+20 VsupplyandRIO,C6,R14andR16,C8, , ,R19,CR17andR18, R20, :Supply 10V 20V 40V 50V5-3 SECTIONVICIRCUITDIAGRAMSC615fL+033-020r- ------------------ ~~NPIII-= ,(1C10 TIOOO-= + + + + 'VV' + ~~RSCR1lOOK1-040-=CR21-04001024-2214-221 RI310 KCR3CR41-0401-040----------------------- ----- - -----------.,III11~~-"'--"'-----""----~~ '\----"""1,,",""----------o+20 VIIItlI-=I-=IIIII_____J*R1=..!.)
9 , VOLTOUTAT1 ~I ~~Cl' ,roo0 MODE[STERE01iMONO]51'~~, +20V+ - - - - - - - - - - - - ---~I+20V+IOVIIIIIIIIIIIIR3 IlOOKII+ :5~+-+.J-:-~t-;:;-v:;:.:,JlVV\r~=:Y-5361 ICIIr~l~ :10~I1CI~ """' :14rIIIIIIIIIIIII2213C5-=2*1+10fLF+20V~C 7*1+10fLF+/OV~I-~P-'1C8~IOfLF-/OV~+IC6~I OfLF-20V~+IIIII+/OV~"""",,'V,,.-'V-IOVII IgF1.~~516 PHONO~TUNER~~51 AINPUTRI6 MONITOR10 KOUTPUT~TUNERR15 MONITOR10 KOUTPUTPHONOTAPE~AUX1 NER-ft ~r"' +---JIt--' * * ~~L-------.:..:<>--~ uuMODE[STERE01iMONO]51' ,52r - - - ----------- - - - - ---11 IIII+IOV+IOV+ !~K211I~~. +6-O-+ '\I\I'v-+-~---+ 'v-f'--+1I*4oo0 ACTIVEFILTER+/OV+/OV+20 VRIBTOPOWERAMP10 KSTEPPEDATTENUATORS3 FPNP-2N3906,1853-0036 NPN-2N3904, ", *pt---<?
10 ' '6* ~~~, ~(_-.,~ thru22;TerminalsontheSmallerConnectorare Shownas1*thru10*.AllResistors1 *andC28*SelectedToCenter10 KHzNotchat10 KHz 100Hz1 ZIBF ilterandControls,----------------------- -----------CR11-040R610KR710 KRIO10 KRI3+ VatOutputwithVolume'tF""~ < ( ~062N5551 CurrentSource+C2" ~AmplifierInputfromDavenAttenuatorI2/ ~-NOTES:\* ,(el.)/AllResistors1I8 WMetalFilmUnlessOtherwiseNoted.,J4 -DigitNumberbyDiodesisDerivedfromPartNum ber:CR1=190J40=1-040 AudioOutJ7,PIOVo-40 VPhoneJackJ8+ 'Jl000pFR21+ ~/::--~-----------------------_~BOOST~FL ATIIIIl:! !1005:..---~~ ~--'\1/1\4I'W---'9-50 VII-------------------------~o)utwith--- ------------------, 'I'.)
