LP Special Posted April 7, 2009 Report Share Posted April 7, 2009 I have a GA42RVT 2x12 combo that I absoluately love. The only problem is that the amp feeds back very easily, even at low-moderate volume levels. This is especially true in Channel 1, particularly with the treble turned up. In fact, maxing the treble on Channel 1 produces a immediate (and loud) squeal. Anyone else having this problem? Any advice?? Thanks! Link to comment Share on other sites More sharing options...
Gonzowerke Posted April 11, 2009 Report Share Posted April 11, 2009 I know this one!(maybe!) I have an '82 Marshal 12 watt solid state that did the same thing. I noticed scratchiness through the speaker when I turned the knobs. I went to Radio Shack and bought a spray can of POT lube/cleaner and opened her up. Spray a burst or two through any opening on your pots and rotate them, then spray again to flush. It fixed mine. If this is a tube amp(I am not familiar with it), then one or more of your tubes may have gone microphonic. If this is the case, the tube re-introduces the output from the speakers into the signal path causing your textbook feedback loop. Warm it up, then GENTLY! tap your tubes one at a time with a pencil. if you hear it in the speakers, then that is most likely your problem. I hope this helps you, Gonzo Link to comment Share on other sites More sharing options...
LP Special Posted April 11, 2009 Author Report Share Posted April 11, 2009 Thanks, Gonzo, I'll give it a try! LP Special Link to comment Share on other sites More sharing options...
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