McIntosh MC240 Power Amplifier Schematic.pdf

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1、 * 7 1_CD 2.7K IW AW R 23 R 24 V 4 I2K 2 W 12 AX7 205V V v v 350V V S / v-r A . .047 , If 1 op 18V Z/ 1/ - 46V 2/-i C5 IpAI 1 3 C 7 n 108 V 35V 3|43v /t4 430V C co Sir 51 .47 -Jf e 8 V 8 / 6L6GC/ 7027-A .7 V YEL It C 9 , VIO 3 fO tr B GRN BRN/WHT 5 BRN LEFT OUTPUT O 18 -TL STEREO PREAN 600X1/ 70.7 V

2、 j PIN I - q PINS I AND PINS 2 AND PINS t AND PINS 4 AND p/ -K-1 -Vq3/ II -46V W L_ 2.2 M A A 6 I2K2W 6” _A A A I2K 2W V 7 R 47 I2AX7 600 XL / 70 7 V OUTPUTS SINGLE CHANP FOR SINGL PARALLEL L AND R; DESIRED 0 IQK IW S rVW _L_ R 39 1 1 2.7K IW tr 00 .047 C 16 8 1/ . 18V 711 p/ K - -46V W- 6 2.2 M _ _

3、-A A A 6 12 K 2 W f _A A A - R 50 4*V LA 4 430V 11 V 10 6L6GC/ 8 7027-A ,7V BLK 3vio/wht C20 7V V 8 6L6GC/ S-. 7027-A 46V SlbrjU 430v RIGHT OUTPUT O 16 .ft ; grn c * BRN/WHT Lgi-C .BLK/WHT iwHT rr R 58 s R 60 V V V R 61 L _L K L * 5% IDLE! FOLLOWI MATCHE R47 AN TO FILAMENTS V 4 I2AX7 s 600 A/70 7V O

4、UTPUTS STEREO PREAMP POWER CONNECTIONS PIN I - GROUND PIN 2 - L INPUT PIN 3 - R INPUT PIN 4 - GROUND PIN 5 - 375 V DC AT I5MA PIN 6 - 25.2V AT I.2A PIN 7 - 25 2 V CENTER TAP PIN 8 - 25.2 V AT 1.2 A 600 A/70.7 V OUTPUT CONNECTIONS PIN I - GROUND, 70.7 V RETURN, AND 600 A C.T, PINS I AND 2 - LEFT 70.7

5、 V OUTPUT PINS 2 AND 3 - LEFT 600 A OUTPUT PINS I AND 4 - RIGHT 70.7 V OUTPUT PINS 4 ANO 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 FOLLOWING COMPONENTS ARE MATCHED TO 1%: R24 AND R 2-7, R47 AND R 50, R I 3 AND R 36, Rll AND R34, * | REVISIONS jW.ir*! 05 “ !W, / ST. NO DAT* v _ 77* SCHEMATIC, MO 240 - 2 /a-20-60 TM . 7 3 */ m DRAWN DY VG CAL* sATvnAt - 4 630-6/ TH? 7.13.60 1-24-41 TRACED HKT3H