AO-63_conversion 电路图 维修原理图.pdf

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1、收音机爱好者资料库 Ra d i o Fa n s .CN P309 V4 V3 V9 V10 V1 V2V6V5 V8V7 E-cap E-capE-capE-cap 6GW86GW8 Reverb Output Transformer AO-24158-2 7591 7591 Bias Bal EZ81 Main Output Transformer AO-30072-1 Power Transformer AO-28788-1 GZ34 Tone Cab Hum Balance Organ Level BRN (P305) P301 P308 to Reverb Tank BRN WHT

2、 GRA (P303) P302 P310 MAIN SPKR REV SPKR P307 724772477247 12AU7 from Reverb Tank Main Rectifier Organ Preamp Main Post amp phase inverter Main Power Amp Reverb Rectifier Reverb Power Amp Reverb DriverReverb Recovery Brushes and Cymbals Organ Reverb Level P304 P306 收音机爱好者资料库 Ra d i o Fa n s .CN REVE

3、RB 100KA V5 - 7247 820 E 2 1 3 470K E 4.7K 220K .01 6 7 8 100 100 100K E 4.7K 220K .01 6 7 8 50 47K .0012 470K Gibbs AO-23580-10 or 4ABCC1B DWELL 1MA 260260260 176 25482 4.6 8.6 1.8 Hammond AO-63 Reverb Driver and Recovery (slightly modified) 470K V1 - 12AX7 150k 3.3K D 2 1 3 1M 47K 270K .1 220K 120

4、K 22K BASS 1M-A TREB 1M-A .001.01 470pF .0047 270K D 4.7K 270k .1 VOL 1M-A 6 7 8 .1 Ampeg Gemini II Preamp 470pF 175196 2.4 2.4 310310 to POWER AMP V6 - 7247 收音机爱好者资料库 Ra d i o Fa n s .CN 2.7K 220K 100F 6 7 8 C .1 220K .1 220K 47K 1K SPEAKER (8 OHMS) 2 6 5 3 4,8 5 6 3 4,8 1 3 470K 2.7K47K 1K 10 100p

5、F 56K .02 V2 - 7247 150 1K C .001 B A B 10 P310 BIAS TEST V3 - 7591 V4 - 7591 350350 177 297 2.2 52 49 -25.2 -25.2 470 470 388 388 244mV 182mV Hammond AO-63 Power Amp from PREAMP INTENSITY 250K-L B SPEED 3M-RA B 6 7 83 2 1 V5-A V5-B .1 .1 470K 470K 470K 1M 4.7K221M .01.01 .022 100K TREM FOOT SWITCH

6、6G16 Vibroverb Tremolo CF BUFFER NOTE 1 NOTE 4 NOTE 2 NOTE 3 NOTE 4 BIAS -20 to -32VDC from Power Supply V7 12AX7 196 204 1.96 388 388 Disable Tremolo with Foot Switch to measure DC voltages Oscillator signal approx 50VAC RMS Freq range = 2.7Hz to 10Hz TREMOLO NOTES Change to 0.022uF for slower spee

7、d. Change to 100K-220K for stronger tremolo. Change to 0.047uF for stronger tremolo. Replace 4.7K|22uF with LED for much stronger tremolo and visual indicator. 1: 2: 3: 4: OSCILLATOR 2.7K3.3K 40/40F 4.7K 20F A 475v B 388v C 350v D 310v E 260v 40/40F HUM BAL 100 5 VAC 430 VAC 430 VAC 6 8 2 4 V10 GZ34

8、 AO-28788-1 5K 6.3VAC FILAMENTS 33 VAC 1N4007 BIAS 10K-L 4.7K + 100F + 100F 5.6K BIAS -20 to -32VDC to INT pot Hammond AO-63 Power Supply (slightly modified) Bias supply converted from Bias Balance to Bias Adjust ALL VOLTAGE READINGS TAKEN WITH LINE SET TO 120VAC WITH VARIAC 3 AMP SLO BLO POWER 1.8K