Suggest checking the filter and coupling capacitors and looking for poor
solder connections.
"Billccm" wrote in message
...
Hello:

I am posting this for a friend. He has an older solid state BOGEN model
C60 PA.
It is intermittent; the audio comes and goes. No motorboating, or
distortion,
just intermittent audio output.

I was wondering if anyone here had any troubleshooting tips, and if you
knew of
a source for a schematic.

Thanks for your time in replying.

Bill