Hiwatt_sa412 电路图 维修原理图.pdf

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1、123456 A B C D 654321 D C B A Title NumberRevisionSize B Date:21-Mar-2002Sheet of File:G:projectsLads2dHIWATT-SA412.ddbDrawn By: V1B 12AX7 V2B 12AX7 R113 100K R108 10K 2W R101 2K2 R1 1M RV2 470K LOG RV1 470K LOG C103 22n C114 1000p R? 220K R109 1K GNDGND GNDGND GND C1b 16uF C1a 32uF GNDGND C114 1000

2、p C115 220p R116 220K RV4 250K LIN RV5 100K LIN RV3 500K LOG C111 47n C110 47n C1 1nF R112 100K R9 22K GNDGND R11 22K RV7 250K LIN GND V4B 12AX7 V4A 12AX7 R128 560K R130 2K2 R127 1M GNDGND RV6 100K LIN GND C3 1000p C2 100n R125 100K R? 1M R126 100K V3A 12AU7 V3B 12AU7 R123 22K R124 2K2 GND C201 10n

3、R202 470R GND R10 470R PRESENCE MID BASS TREBLE MASTER VOLUME R120 82K R119 91K R201 10K VOLUME NORMAL VOLUME BRILLIANT R117 22K 2W C118 47n C119 47n V5 EL34 V6 EL34 R209 100K R212 100K R207 22K R214 22K GND R19 1K 5W R20 1K 5W PARTRIDGE TG6556 16 Ohm COMM. 8 Ohm GND MAINS TXFMR 350-0-350 VAC 1. HEA

4、TER WIRING NOT SHOWN GND F1 1A HT FUSE D220 BYX94 D221 BYX94 D211 BYX94 R213 110K R205 27K GND C206 100uF GND BIAS -36V GND C8 220uF C7 220uF R15 220K R16 220K GND STANDBY SWITCH R216 100R 5W R14 220K R12 220K GND C6a 50uF C6b 50uF C5 220uF GND R13 1K 1W +460V +420V +420V BIAS -36V GND H1 NEON Rneon

5、 220K STANDBY INDICATOR SW3 MAINS SWITCH A N E GND Ian Miller 11 HIWATT SA412 - Maufacture Date 8/10/1974 NOTES 450V450V SW2 (2x220K in II ) SW1 GND C3 47nF CLASS Y2 POLARITY SWITCH H2 NEON RES POWER ON INDICATOR F2 3A MAINS FUSE 350V 350V 350V63V TOP BOTTOM GND NORMAL CHAN. R2 68K R3 68K 7 8 6 V1A

6、12AX7 R101 2K2 R4 1M R106 220K GNDGND TOP BOTTOM GND BRILLIANT CHAN. R5 68K R6 68K 2 3 1 C102 47nF GND R7 470K R8 470K 7 8 6 C131 47nF GNDGND 6 7 8 1 2 3 C127 22nF C122 100nF INTERNAL SPEAKERS EXT. SPKR SLAVE OUT R17 10K R18 100R 2. C1 16+32uF NOT AVAIL. REPLACED WITH 50+50uF 4. BYX94 DIODES OBSOLETE REPLACED WITH 1N5408 5. V2A (half 12AX7) IS NOT USED (16 Ohms) (8 Ohms) 1 2 3 6 7 8 3. C206 REPLACED WITH 220uF/63V 1 3 4 5 8 收音机爱好者资料库 Ra d i o Fa n s .CN