McIntosh-MC275-pwr-sm 维修电路原理图.pdf
MAINTENANCE MANUALMC275STEREO POWER AMPLIFIER(Serial No.s 275-10001 to 275-10147and 100E1 & above)RadioFans.CN 收音机爱 好者资料库600 A/70.7 OUTPUT RECEPTICAL CONNECTIONSPIN 1-GROUND, 70.7 V RETURN, AND 600 A C.T.PINS 1 AND 7- LEFT 70.7 V OUTPUTPINS 2 AND 3 - LEFT 600 A OUTPUTPINS 1 AND 8 - RIGHT 70.7 V OUTPUTPINS 4 AND 5- RIGHT 600 A OUTPUTSINGLE CHANNEL (MONO) OUTPUT NOTEFOR SINGLE CHANNEL OUTPUTPARALLEL OR SERIES CONNECTTHE L AND R OUTPUTS TO OBTAINDESIRED OUTPUT IMPEDANCE.* 5% TOLERANCE RESISTORSA FOLLOWING COMPONENTS AREMATCHED TO 1%:R11 AND R36R13 AND R38R24 AND R27R49 AND R52VOLTAGE AND RESISTANCE CHARTThis resistance measured with condenser C25A shorted to ground.This resistance measured with condenser C24B shorted to ground.High impedance VTVM is used to measure the operating voltages.Resistance inOhms Unit OffAC Volts atrated outputDC VoltsNo. SignalPin No.Tube160K*1M3.3K0160K*1M3.3K2.1.47.4402.1.47.446.31000.9501000.9501234&5678912AX7(VI)37K*160K*18K040K*2.4M18K0122.1.960120.966.324010010602408410601234&5678912AU7(V2 or V5)12K*210K2.7K012K210K2.7K015212.7015212.76.336522400365224001234&5678912BH7(V3 or V6)38*1M170K038*1M170K011215214901121521496.3205-57-570205-57-5701234&5678912AZ7(V4 or V7)038260170K6150 or 6.31161121496.3 or 01160450450-570.612345678KT88/6550(V8, V9, V10.V11)RadioFans.CN 收音机爱 好者资料库SC 125-109 CSpecial components used in the MC275 are listed below.These components are designed and built specifically for theMC275. They may be purchased directly from MclntoshLaboratory by ordering from the Service Department. Besure to mention Schematic No., description, and modeland serial number for your amplifier when ordering parts.LABORATORY, INC.2 CHAMBERS STREET, BINGHAMTON, N. Y.Made in U.S.A.Phone-Area Code 607-723-54912M-HP-761SCHEMATIC NO.C24,C25,C26,C27L1, L2, L3, L4L5R1, R2, R3R7R59S2SR1,SR2,SR3,SR4SR5T1T2T3DESCRIPTIONFilter Capacitor 100/30 mfd 500/450VRF ChokeFilter ChokeGain Control, 250KBalance ControlThermistorInput Selector SwitchSilicon Rectifier, 600 PIV at 500 MASelenium Rectifier, 400 PIV at 75 MAOutput Transformer, Type M-216AOutput Transformer, Type M-216BPower Transformer, Type M-215
