ehutch
Joined: Feb 27, 2006
Posts: 44
Seattle, WA
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Posted on Oct 27 2006 06:30 PM
So I was playing guitar for about an hour yesterday with a reissue reverb unit into my reissue twin. The signal started getting choppy, fading in and out and kinda grungy so I decided to quit. When I turned off my amp the power/standby switches were much hotter than normal and something smelled like it was burning. Jake thought that might be a capacitor on the PCB but it wasn't (thanks by the way).
I basically have no working knowledge about amps but I tried a couple things and its the unit that had the choppy signal and grungy sound. Any ideas what this is?
When I checked on my amp. It was making a new disonant ringing that was pretty awful. It intensified as the reverb was turned up. The ringing was only really noticeable when doing a hammer on and holding the note.
I kinda poked around the back of the amp and the only thing i saw was that one of the tube's spring was off kilter. Could this be the source of the trouble? or just the first step. Any help would be greatly appreciated!! Thanks.
Eric
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— Surf in Seattle?
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SurfBandBill
Joined: Mar 15, 2006
Posts: 1487
San Francisco
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Posted on Oct 28 2006 07:52 PM
The tube is a good place to start, but the chances of that being the sole offender... not too good.
Without seeing the amp, a couple other ideas would be to check all your audio connections -- RCA plugs or speaker wires, anything.
Also, just go caveman and give the amp a good smack. That will tell you if it's a matter of something being slightly out of whack or a larger problem. Give taps all along the chassis so you can possibly isolate the spot wherever any bad connection may be, then at least you know the area to look in.
Do you have the same problem in both channels? That would be a good A/B test to start with.
~B~
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JakeDobner
Joined: Feb 26, 2006
Posts: 12159
Seattle
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Posted on Oct 28 2006 08:31 PM
Eric, I didn't hear you mention that ringing. I have that problem as well. It is intensified as the reverb goes up. Does it sound amplified when you don't have the reverb on? Mine doesn't, when you turn the reverb up then you can hear it through the speaker. This is on my '64 Vibroverb by the way. I took the amp in to my bandmate Mike's work and he and their amp guitar looked it over for a day looking for the cause and they couldn't find anything. The amp guy is really good as well.
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ehutch
Joined: Feb 27, 2006
Posts: 44
Seattle, WA
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Posted on Oct 29 2006 09:34 PM
The problem seems to be in both Normal and vibrato 1/2 channels. All the connections seem fine and the amp sounds solid after a few whacks.
It's not as noticeable when played clean, but when the reverb is up it almost sputters and gives a faint 2nd delay type signal rather than a smooth fluid reverb. I'm assuming this will be one for the techs and not a fishing expedition on my part...ugh.
— Surf in Seattle?
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