Marshall_18w 电路图 维修原理图.pdf

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1、SPEAKER 6.3 VAC filaments 5 VAC tap not used C20-A 32uF C2 16uF R5 1.5K / 2W R6 8.2K / 2W A 342 VDC B 326 VDC C 290 VDC 290 VAC 290 VAC 7 3 1 V6 123456789 V114701.2htrhtr14701.2htr V22144867htrhtr2114867htr V315301htrhtr9901htr V4nu011htrhtrnu324nu318 V5nu011htrhtrnu324nu318 TUBE VOLTAGE CHART Measu

2、red with Fluke 87 III DMM. All controls max CCW. Footswitch in off position. MARSHALL 1974 18 WATT Drawn By Steve Luckey October 13, 2006 V5V4V2V1 4455 4499 55 EZ81 5 4 6.3 VAC 6.3 VAC V3 4 9 5 NEUTRAL LINE 2 AMP SLO BLO C20-B 32uF 3 2 1 HI (1) LO (2) R2 820 C11 50uF R7 100K V1 12AX7 C N O R M A L R

3、4 1M R3 1M 6 7 8 C6 .01uF C5 .005uF R30 Tone 500K-A Rx 120 R31 Vol 500K-A R1 100K 8 7 6 R27 68K R28 68K R8 1MHI (1) LO (2) R12 220K V3 12AX7 C T R E M O L O R14 820 R10 2.2M C18 50uF R32 Intensity 1K-L R11 100K 1 2 3 A C17 .01uF R25 150/5W R16 470K C16 .01uF R15 470K R18 100K R21 8.2K 2 2 3 7 9 3 2

4、7 9 B 1 3 C3 50-500uF R22 8.2K V2 12AX7 V4 EL84 V5 EL84 C R25 100/2W C 7 8 6 C15 .005uF C12 .005uF C8 .01uF C9 .01uF C10 .01uF C14 470pF R35 Volume 500K-A R34 Tone 500K-A C13 .005uF C7 .05uF R24 470K R33 Speed 2M-A R26 1M R29 470K Rx added to prevent oscillation Cx and Cy added to prevent tremolo ti

5、ck Cx 220pF Cy 33pF R13 820 R17 47K R9 470K R23 470K C1 .01uF C18 .022uF R19 100K Footswitch 16 8 4 收音机爱好者资料库 Ra d i o Fa n s .CN + + 47F 25V .0047F 630v .01F 630v .01F 630v .022F 630v .0047F 630v .0047F 630v + + 47F 25V .047F 630v .01 .01 .01 .01F 630v .01F 630v 220pf + + 16F 475V 33pf 150 ohm 5 wa

6、tt + + 100F 25V V1 12AX7 Normal preamp V2 12AX7 Phase inverter V3 12AX7 Tremolo preamp and oscillator V4 EL84 Power amp V5 EL84 Power amp VOLUME 500KA TONE 500KA VOLUME 500KA TONE 500KA INTENSITY 1KL SPEED 2MegA HI LO HI LO 470pf.0047F 630v B+GndGnd Gnd Board Dimensions:10 1/16 x 2 5/8 Designed by:Steve Luckey Date:October 13, 2006 Marshall 18 Watt Board Layout These caps added for stability in the tremolo circuit 收音机爱好者资料库 Ra d i o Fa n s .CN