silverface concert lead

[djc]

the reverb has what sounds like a ground loop (60 cycle hum or something).  is there a way to rid the reverb chain of this?  everything else works great, just the reverb when turned up has a hum/buzz.  is this normal for this amp?  does anybody play these amps?

[basiklybass]

Not normal for the amps. Many times the driver transistors and associated circuitry drift out of specs and can cause strange things to be heard. I just downloaded the schematic because the reverb on my Concert PA doesn't work. If I find anything or see anything on the schematic, I'll post  back.

[djc]

thanks.  it's not necessary, but I would like it to work