Could this just be transformer noise -- i.e. mechanical hum? I just pulled out my old Adcom GFA555 (original version from the early 80's) for use as a sub amp. Works great but has a hum that's only audible when my system is off and it is dead quiet (except for the amp). It's not a major problem, since I can't hear it when listening, but I was planning on pulling the top and trying to tighten the transformer. Maybe lay a sheet of sorbothane under it?
These old amps are such work horses. Do they ever die? The only other glitch is that the power on/off switch just broke. But, as I've seen reported elsewhere on Audiogon, it broke in the "on" position. Even when they break, they work.
These old amps are such work horses. Do they ever die? The only other glitch is that the power on/off switch just broke. But, as I've seen reported elsewhere on Audiogon, it broke in the "on" position. Even when they break, they work.