Help with Heath AA-18

Jeffrey Herman jeffreyh at HAWAII.EDU
Sun May 31 13:19:15 EDT 1998

I've got a Heath AA-18 (audio amplifier) which is not amplifying;
output is only a loud hum. Al (ni4q at sent me a very fine
copy of the manual; the voltages in the amp are all lower than
those on the schmatic (21v bus is 15v, 14v bus is 10v). I replaced
all the electrolytic caps - the voltages are still all off, and the
hum is still present. The power x-former's secondary is reading a
correct 34v (center tap is correct at 17v).

This is a SS device, but at least it's a Heath! Any suggestions what
to do next?


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