McIntosh-MC-275-Service-Manual 电路图 维修手册.pdf

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1、MAINTENANCE MANUAL MC275 STEREO POWER AMPLIFIER (Serial No.s 275-10001 to 275-10147 and 100E1 & above) RadioFans.CN 收音机爱 好者资料库 600 A/70.7 OUTPUT RECEPTICAL CONNECTIONS PIN 1-GROUND, 70.7 V RETURN, AND 600 A C.T. PINS 1 AND 7- LEFT 70.7 V OUTPUT PINS 2 AND 3 - LEFT 600 A OUTPUT PINS 1 AND 8 - RIGHT 7

2、0.7 V OUTPUT PINS 4 AND 5- RIGHT 600 A OUTPUT SINGLE CHANNEL (MONO) OUTPUT NOTE FOR SINGLE CHANNEL OUTPUT PARALLEL OR SERIES CONNECT THE L AND R OUTPUTS TO OBTAIN DESIRED OUTPUT IMPEDANCE. * 5% TOLERANCE RESISTORS A FOLLOWING COMPONENTS ARE MATCHED TO 1%: R11 AND R36 R13 AND R38 R24 AND R27 R49 AND

3、R52 VOLTAGE AND RESISTANCE CHART This 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 in Ohms Unit Off AC Volts at rated output DC Volts No. SignalPin

4、No.Tube 160K* 1M 3.3K 0 160K* 1M 3.3K 2.1 .47 .44 0 2.1 .47 .44 6.3 100 0 .95 0 100 0 .95 0 1 2 3 4&5 6 7 8 9 12AX7 (VI) 37K* 160K* 18K 0 40K* 2.4M 18K 0 12 2.1 .96 0 12 0 .96 6.3 240 100 106 0 240 84 106 0 1 2 3 4&5 6 7 8 9 12AU7 (V2 or V5) 12K* 210K 2.7K 0 12K 210K 2.7K 0 152 12 .7 0 152 12 .7 6.3

5、 365 22 40 0 365 22 40 0 1 2 3 4&5 6 7 8 9 12BH7 (V3 or V6) 38* 1M 170K 0 38* 1M 170K 0 112 152 149 0 112 152 149 6.3 205 -57 -57 0 205 -57 -57 0 1 2 3 4&5 6 7 8 9 12AZ7 (V4 or V7) 0 38 260 170K 6 15 0 or 6.3 116 112 149 6.3 or 0 116 0 450 450 -57 0 .6 1 2 3 4 5 6 7 8 KT88/6550 (V8, V9, V10.V11) Rad

6、ioFans.CN 收音机爱 好者资料库 SC 125-109 C RadioFans.CN 收音机爱 好者资料库 Special components used in the MC275 are listed below. These components are designed and built specifically for the MC275. They may be purchased directly from Mclntosh Laboratory by ordering from the Service Department. Be sure to mention Sch

7、ematic No., description, and model and serial number for your amplifier when ordering parts. LABORATORY, INC. 2 CHAMBERS STREET, BINGHAMTON, N. Y. Made in U.S.A. Phone-Area Code 607-723-5491 2M-HP-761 SCHEMATIC NO. C24,C25,C26,C27 L1, L2, L3, L4 L5 R1, R2, R3 R7 R59 S2 SR1,SR2,SR3,SR4 SR5 T1 T2 T3 D

8、ESCRIPTION Filter Capacitor 100/30 mfd 500/450V RF Choke Filter Choke Gain Control, 250K Balance Control Thermistor Input Selector Switch Silicon Rectifier, 600 PIV at 500 MA Selenium Rectifier, 400 PIV at 75 MA Output Transformer, Type M-216A Output Transformer, Type M-216B Power Transformer, Type M-215