Hello,

Hoping someone here might have an idea. I have an (OLD) Peavey Musician Guitar Head. Technically I guess it's a Mark I, but it actually predates the Mark name. It's a series 400GH. Bought new in 1980 and used (very little gigging) through the mid-late 80s. Never a problem with it then. Sat on the shelf for the last 20-25 years.

I pulled it down recently to use/leave at practice. Plugged it in and it began to smoke. Brought it home, took the heat sink/circuit board out (separate install from the transformers and the control panels) and vacuumed out the dust. Found a small piece of aluminum (tab off the bottom of an old soda cap) was lodged against the transformer. Removed it, reassembled and plugged in. No Smoke. Yay. Plugged in a speaker cable to speaker cab and immediately got a huge buzz. Instrument sounds DID come through over the buzz.

Tried various cables, outlets etc. No change. Know the speakers work - just played a gig with them a couple months ago. Listened closely with everything unplugged and the amp on. The amp ITSELF seems to be humming/buzzing. Not loud - ear to the box kind of thing. But it's there.

Any ideas? I'm assuming a ground short, but not sure instrument would come through cleanly over the buzz if that was the case. Transformer problem? Box was never opened before and I didn't pull anything loose.

Any help would be appreciated.

Thanks

Nick