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Messages - 68Ric370

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Thanks guys.

I won't have a chance to look at it again until this week sometime. I'll check the speaker movement for DC and, as I'll have more time than the other day, I'll take it back apart and check for anything that looks loose, cracked etc.

One thing I forgot to mention the other day (and not sure if it's of vallue), but the buzz comes from either output. This amp has a direct out which delivers 300W into 2/4 Ohms and a X-Over out that delivers 200W into 2/4 Ohms. I might have those figures backwards, but the point is, it's a separate output channel since it runs through a x-over transformer, right? Anyway, as I said, not sure that adds anything.

The smoke, btw, wasn't some huge wildfire. it was more a single source point, like a cigarette inside the case, so I'm guessing that was a component burning. And it may well have been 20 years of dust on a hot point.

I'll report back later in the week after a better exam and the DC test.

Thanks again

Nick

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Amplifier Discussion / Old Peavey Musician Head - Help! Buzzing problem.
« on: August 23, 2012, 02:08:03 PM »
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

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