Luxman-CL35lll-pre-sm维修电路原理图.pdf

ULTIMATEHIGHFIDELITYSTEREOCOMPONENT lOOOO)GjOCL35/m CONTROL CENTER SERVICEMANUAL RadioFans.CN 收音机爱 好者资料库 CIRCUITDESCRIPTION . 1/212AX7 ECC83 1/212AX7 ECC83 1/212AU7 ECC82 200V 2JV l.OK t-;jw:lSignal output 2,H non ieverted in put fig. -1 Equalizer Amplitier inverted input ThecircuitisshownintheFig.1.ThisamphasnotstandardmethodofFeedback,about whichspecialexplanationismadehereunder. Fig.2 showsitsconcept,whereinA-3 meanscathode-followerwithitsgainatOdB.While A-2has+39dBandthereforethegainis+39dBthruA-2 and A-3. AtA-Itheoutputimpedanceis110K ohms by meansofelectricfeedbackfromthecathode side.Localfeedbackby 2.2MohmscanbestipulatedasthformulaBeta=1/19.8and amountof NFis14dB.Thereforethegainis+25dBthruA-2andA-3, andinputimpedancebecoms210Kohms. AtA-Iloadis120K ohms andgainis+32dB, andthereforethetotalgaLnis57dB. Fig.3showsR.I.A.A.complex.The. totalNFshallnotbeleviedbelowthe cut-offfrequencyof50Hz.Inthecase oftriodeitispossibletosuppressthe distortionbelowthesensinglevelunder flg.-2 smallsignals.Thepresentoperation pointliesatthetotaldistortion balance. II ,. . . 330lPF PF IIII l;F rr 220PF 2201< . phonoposition MlCposition Thisamp.playstheroleofmic.amp.as well. fig.-3 RadioFans.CN 收音机爱 好者资料库 1/212AX7 ECC83 1/212AX7 ECC83 82K 18K10K .-_-Cl+21OV fig.-5 output 1/400V noninverted input0-11- inveried inut o-r-1IH fig.-4 Fig.4 showsthecircuit,wherethe2ndstageisconstitutedbydualampsoflocalfeedback. ThefeedbackcircuitisshowninFig.5.owFrequencyTrimmeroperationisdonebythefeedback circuit.AttheG)positionroll-offtakesplaceat100Hzandcut-offtakesplaceat250Hz, whileatthe()positioncut-offcommencesat100Hzandroll-offstartsat220Hz. 25lJ<.B 1/212AX7 ECC83 ToneControl l.05mA 245V MadeofLUXsexclusiveNFtype. AllcircuitsareshowninFig.6. Thisisstandardtonecontrol withLUXamps.Incidentally operationoftubesatthisstage dependsondistortionandlevel ofgridcurrent. Signal output 1/400V 140V 10001< Signol input fig.-6 fig.- 271 Signnl ovtput LowCutFilter AsperFig.7.thisis-12dB/oct.filter composed by2-stagecouplingofCR. Thisfilterfrequencydependsonthelevel setvolume,andthestandardpointliesat the5thdecrementfromthemax.position (-6dB). 2 RadioFans.CN 收音机爱 好者资料库 ?45V :!2!_2.:. Composed bycathode-followerasperFig.8. Thebiasisfixedatthisstage.Noise ofzenerisreduceddowntothealiowable Signal levelbyhighcutfilter. Jutp.Jl fig.-S 4700P 4.7K 5.6K92rnH -g,!_!: Shown byFig.9,andattenuates-12dB/oct.by meansofLC.Thefilterfrequencyis decidedinviewofloadandlOOKohms+200pF (maininputimpedanceandshieldwire). Signao-c)-.M)-f-1I- OUTPUT HEADPHONE TONE CONT. AMP CATHODE FOLLOWER OUTPUT LEVELSET BASS FREQUENCY .,-.:;,SELECTOR.-,. AB L.CH. NCONNECTOR R.CH BA R.CH. .ThisdiagramisfortheLEFTCHANNEL. Power source sectionomitted. I ,I I, INPUT SELECTOR r-r-, III I AUX2 AUX MIC. 11NPUT IMPEDANCE SELECTOR AUX3 PHONO2 PHONO1 MIC.J.ACKrr: -J RadioFans.CN 收音机爱 好者资料库 SPECIFICATIONS Tubes: FrequencyResponse: T.H.O.: OutputVoltage: OutputImpedance: InputSensitivity: (output;1V, outputlevel max.) Input Impedance: SIN Ratio: Equalizer: Tone Control: Bass: Treble: Filter: Low Frequency Trimmer: 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-ohms phono-1l.4mV phono-2l.4mV aux-l140mV (variable) aux-2140mV aux-3140mV (variable) microphone0.7mV phono1lOOK ohms, 50K ohms, 30K ohms phone-250K ohms aux-llOOK ohms aux-2150K ohms aux-3lOOK ohms microphone 50K ohms better than 64dB (phono-l II.u1 .-0-.1111IIIDclIlisML_Ir-S.SI,te21IIIt W 2-u.s.IIII11D2So,I, v._,2I:rS2CII_g1,1YJlilAl PHONO-III,.25A,l.A,lorAl./v?JIr.:VI25OIll(1)I C .D6lafCHII.IM ._ Cll_,_11511f-JINV!lt-+_51J. -IIIl1.ullllHOD .ICV,-,Z:-W.V-t-,-t.r.Jl-1.J!.Jl- SI.1A<111;3 1 SIt.-IIs,!.L 1111miD.14llct!ofr-31: PHONO-II, lliDIHII2lD.Cll11IIf!.:;?.It.I.C/11- I1Pr,;-;t1.-.!lICll.il,1_Cll,I.21,1 tI!;,.J2AxlI11IZ.211.12Ax1,.1ZAIlI,.2AxlI1l156DID.12Axl.:;,.12Axloc.fZAxl lUX-IIVI,.Z5IIll(A)+-t-.I_-107VVIllII1Vk-;I;I;21!-lsHI.DfH. lUX-IfC-S),2I.1101.rnrr_-T.J.-II;,;._+-+-.-.,!lzn;tll;,;._lfICllU,JqD.l:UIDI_111.;- IS.11151.IID_/_:;LI,r._!_C,lllpI,SHItiI1i:5)I!5)SlI.Ir-.,H2117,mlll Il,mD5Jr.-1.1:.t.II=;- :JIV-:1oJ:11f-+I-II-IN1-ID-+-IJ_iffh!: m;f1:-H!niriJ:,1L.H-:-I1jmjl-DIf-PREOUT _+-_-Jl-+-J-+_+-+-+_-I-+-_-t-.-+._-+.,+.;.-t-.o.-+-+-.-+.-.-+-.-;-+-1- Ill l-1- AIlIIIII.St! 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IM. lowCut HillCil .ow. Plito,P SIfUpT. S I. MDtiIor -1- STa,lb. S2,.2b,2e,2d, S3,.3b,3e,3d,3e,31, S44b.4e.4d, S5a,5b, S8 S7,.7b, Sea.8b.8e,8d, Sea,8b.ge,ed, SIO,lOb, Sll.llb. S12,12b.12e,12d, S3,13b.13e,13d, S14 L_ I 111nlll 11.,lIlIlllI I 5(;?I, r-t; If2lI t-t-: 1 I 1 I I I Sr.Z .,OOI Slb1,11.lll A) / o t-.,.+H-1-!;,.-=- PH010-I lUX-II PHONO-II IIC lUX-III lUX-I IICJlCK MONITOR-l RECOUT-II RECOUT-I MOIITOR-II MONITOR-I RECOUT-I MONITOR-II RECOUT-II RadioFans.CN 收音机爱 好者资料库