Joe Schneider said:
.....
> caused one of the ground traces to burn and physically lift off the PCB
> before blowing the fuse, something bad happened, and I was able to
> narrow down most of the problem to a blown diode in the bridge rectifier
> of the power supply. I had the whole thing apart, threw the new part in
> and it worked!  Ok, so then I put the whole thing back together, turn it
> on, and get what sounds like a square wave (maybe around 20 Hz) for
> about a second before the fuse blows.  Take it apart again, replace the
> fuse, works fine?? What's the difference?? The front panel of the amp is
> grounded to earth ground wire straight from the outlet.

Power transformer has short from one winding to case? Or some other way AC
line is connecting to case?

Repair the ground trace, get out your ohmmeter and start unhooking things
until the short goes away.

-Bob

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