autotek model 44 repair help

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I think you should try a different Zener. Use the original part number instead of an NTE part. This diode is either breaking down at the wrong voltage or something in the amp is preventing the votlage from going negative. Since I don't trust NTE parts, I'd suggest replacing the diode first.
 
alright ran 2(12 volt zeners) plus a (5.1v) zener in series for a total voltage of (29.1v).

so far tested whether or not it goes into protect WITHOUT rcas hooked up or any speakers. goes into protect @ about 7/8 gain. before that, no protect.

guess i will proceed to testing a speaker plus audio input.
 
Did audio test, still goes into protect after turning up to about 3/4 to 7/8 gain. right channel has most static/distortion, left channel sounds decent, best sound comes out of a bridged configuration.

Speakers still "pulses" here and there.
 
actually it doesn't work "right" @ any gain level. if i turn the knob up it really doesn't do anything but make a static noise. but there is music coming through, bu very staticy.

i started the amp up @ half gain with radio turned up, and it was quite loud, once i turned the gain down it wouldn't turn back up.
 
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