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Acoustic 470 PA issues

Started by gbono, July 08, 2009, 10:17:46 PM

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gbono

#15
August 11, 2009, 01:35:12 PM
Okay it looks like Q404 isn't turning on with 51V on the base and 46 on the emitter - I've checked all the resistors from R417,418 and 419 and they are okay. The trim pot (R406) also seems to work but it has no effect on the base volatge of Q404. Stumped.
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