Odd buzzing sound from amp?

Corbic

New member
Hey guys, I've got something of a problem with my tube amp. I'm not entirely sure what, so I thought I'd ask here.

Since Monday this week, I've been jamming every night at my drummer's house, working on new songs and stuff. Since we didn't have our bassist/keyboardist, I decided to try something a little different with the amp then what I normally do. I turned the preamp gain way down, turned the overdrive level up to about 3/4 of the way, then preamp 1/3 of the way, and blasted an open G power chord on my Les Paul. Instant AC/DC tone! It was so pure sounding, distorted, but still very clean. Compressed, but with so much touch sensitivity. Thick but still capable of light and airy-ness. It was truly incredible. So, for two days I ran it like that.

Then tonight, I decided, hey if this sounds pretty good, how good must it sound a little bit higher? So I took the overdrive level up one notch, and blasted out the same power chord. Amazing! It sounded so good, so loud, but so good. I can't even describe how truly remarkable it sounded. I never want to play it lower than 8 again :D

But now, here's the problem I have. After about an hour of playing like that, I let one note feedback for a while. A bent note, bit of vibrato on it, feedbacking and sustaining, I felt like Gary Moore in the middle of Parisienne Walkways! But then I noticed there was some buzzing in the background. I didn't think it was anything, probably something buzzing in the room from the volume. But as I kept playing, the buzzing got louder and louder, and I realized it was coming from the amp. What could this be? Bad preamp or power tube? Some loose connection in the amp? Ripped speaker cone (the buzzing reminded me a bit of that Kink's You Really Got Me torn speaker sound)? If it's anything other than the speaker or tubes, its still covered under my amp's warranty, so I'm wondering whether you guys think its either of those, or if I should just send it in? Thanks guys, I really appreciate the help!

-Corbic
 
Re: Odd buzzing sound from amp?

Could be a bad preamp tube. Are you still playing with the gain up? You get more noise with more gain and volume.
 
Re: Odd buzzing sound from amp?

At this point, the gain is only about one quarter/third the way up. The master volume is up around 3/4 though, and the buzzing kind of goes away if I turn down a bit. There's some kind of test to find out if preamp tubes are microphonic by tapping them with a screwdriver or something, is there any test that could tell me if the preamp tubes are causing this buzzing/rattling?
 
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