Luxman-CL35lll-pre-sm 维修电路原理图.pdf
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1、 ULTIMATEHIGHFIDELITYSTEREOCOMPONENTlOOOO)GjOCL35/mCONTROL CENTERSERVICEMANUALRadioFans.CN 收音机爱 好者资料库 CIRCUITDESCRIPTION.1/212AX7ECC831/212AX7ECC831/212AU7ECC82200V2JVl.OKt-;jw:lSignaloutput2,Hnon ievertedin putfig. -1Equalizer AmplitierinvertedinputThecircuitisshownintheFig.1.Thisamphasnotstandardm
2、ethodofFeedback,aboutwhichspecialexplanationismadehereunder.Fig.2 showsitsconcept,whereinA-3 meanscathode-followerwithitsgainatOdB.WhileA-2has+39dBandthereforethegainis+39dBthruA-2 and A-3.AtA-Itheoutputimpedanceis110K ohms by meansofelectricfeedbackfromthecathodeside.Localfeedbackby 2.2Mohmscanbest
3、ipulatedasthformulaBeta=1/19.8and amountofNFis14dB.Thereforethegainis+25dBthruA-2andA-3, andinputimpedancebecoms210Kohms.AtA-Iloadis120K ohms andgainis+32dB, andthereforethetotalgaLnis57dB.Fig.3showsR.I.A.A.complex.The.totalNFshallnotbeleviedbelowthecut-offfrequencyof50Hz.Inthecaseoftriodeitispossib
4、letosuppressthedistortionbelowthesensinglevelunderflg.-2smallsignals.Thepresentoperationpointliesatthetotaldistortionbalance.II,.330lPFPFIIIIl;Frr220PF2201.phonopositionMlCpositionThisamp.playstheroleofmic.amp.aswell.fig.-3RadioFans.CN 收音机爱 好者资料库 1/212AX7ECC831/212AX7ECC8382K18K10K.-_-Cl+21OVfig.-5o
5、utput1/400Vnoninvertedinput0-11-inveriedinuto-r-1IHfig.-4Fig.4 showsthecircuit,wherethe2ndstageisconstitutedbydualampsoflocalfeedback.ThefeedbackcircuitisshowninFig.5.owFrequencyTrimmeroperationisdonebythefeedbackcircuit.AttheG)positionroll-offtakesplaceat100Hzandcut-offtakesplaceat250Hz,whileatthe(
6、)positioncut-offcommencesat100Hzandroll-offstartsat220Hz.25lJ.B1/212AX7ECC83ToneControll.05mA245VMadeofLUXsexclusiveNFtype.AllcircuitsareshowninFig.6.ThisisstandardtonecontrolwithLUXamps.Incidentallyoperationoftubesatthisstagedependsondistortionandlevelofgridcurrent.Signaloutput1/400V140V10001Signol
7、inputfig.-6fig.-271Signnl ovtputLowCutFilterAsperFig.7.thisis-12dB/oct.filtercomposed by2-stagecouplingofCR.Thisfilterfrequencydependsonthelevelsetvolume,andthestandardpointliesatthe5thdecrementfromthemax.position(-6dB).2 ?45V:!2!_2.:.Composed bycathode-followerasperFig.8.Thebiasisfixedatthisstage.N
8、oiseofzenerisreduceddowntothealiowableSignallevelbyhighcutfilter.Jutp.Jlfig.-S4700P4.7K5.6K92rnH-g,!_!:Shown byFig.9,andattenuates-12dB/oct.bymeansofLC.ThefilterfrequencyisdecidedinviewofloadandlOOKohms+200pF(maininputimpedanceandshieldwire).Signao-c)-.M)-f-1I-OUTPUTHEADPHONETONE CONT.AMPCATHODEFOLL
9、OWEROUTPUTLEVELSETBASS FREQUENCY.,-.:;,SELECTOR.-,.ABL.CH.NCONNECTORR.CHBAR.CH.ThisdiagramisfortheLEFTCHANNEL. Power source sectionomitted.I,II,INPUT SELECTORr-r-,IIIIAUX2AUXMIC.11NPUT IMPEDANCESELECTORAUX3PHONO2PHONO1MIC.J.ACKrr:-J SPECIFICATIONSTubes:FrequencyResponse:T.H.O.:OutputVoltage:OutputIm
10、pedance:InputSensitivity:(output;1V,outputlevel max.)Input Impedance:SIN Ratio:Equalizer:Tone Control:Bass:Treble:Filter:Low FrequencyTrimmer:Attenuator:Accessories:Dimensions:Weight:12AX7 (6),12AU7(1)15Hz-40,OOOHz(-ldB)no more than 0.06% (ratedoutput:2V)Max. 15V (distortion 0.3%)550-ohmsphono-1l.4m
11、Vphono-2l.4mVaux-l140mV (variable)aux-2140mVaux-3140mV (variable)microphone0.7mVphono1lOOK ohms, 50K ohms, 30K ohmsphone-250K ohmsaux-llOOK ohmsaux-2150K ohmsaux-3lOOK ohmsmicrophone 50K ohmsbetter than 64dB (phono-l & 2)better than 77dB (aux-l & 2 & 3)better than 60dB (microphone)R.I.A.A. (strandar
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