AO-44_conversion 电路图 维修原理图.pdf

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1、A .02 130/3W 470K .02 470K 100K SPEAKER (8 OHMS) 1 8 7 6 3 7 8 6 3 V2-A V2-B V1-B Pee Wee HAMMOND (AO-44 conversion) Schematic by Steve Luckey on August 27, 2013 B 100K 9 2 9 1 2 V1-A 100K 3.3K .02 1M 3.9K 100 2 each ECL86/6GW8 DC 120 VAC 60Hz 6.3 VAC w/CT 303030 1K / 1W5.6K A 302 VDC B 290 VDC C 27

2、2 VDC 250 VAC 250 VAC 1 3 7 V3 V2V1 4 5 EZ-81/6CA4 D 268 VDC 20 1.2K 4 5 68K 10K 1W .001 1KV 250KA 250pF .1 .047 100K 68K 1M1.5K 100K 250KA 6.8K TREBLE 1MA VOLUME 120pF BRIGHT BASS 1 2 3 D 6 7 8 100K 1.5K .02 470K DFender AB763 preamp 155 1.6 00 1.6 12AX7 or 5751 144199 0 1.951 49 296 0 0 296 290 29

3、0 220 NOTE 1 Conversion notes Removed transistor circuitry and Volume Compressor. Power amp and power supply are completely stock AO-44 except for note 1. Added Fender AB763 Normal Channel preamp. Voltages measured with Fluke 87V. Line voltage set to 120VAC. NOTE 1: Original value was 10K. Changed to 1.2K to increase B+ to the AB763 preamp. 8.2 LED 4.7K V3 4 9 5 V3-A V3-B 收音机爱好者资料库 Ra d i o Fa n s .CN NOTE! Not all AO-44s are the same. This later schematic matches the actual amp used in this conversion. 收音机爱好者资料库 Ra d i o Fa n s .CN