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Amp fails on loud notes

I have a little GK MB200 amp, purchased in 1984. It's always been loud for its size, but lately, when it's cranked to 10 and I strike hard on a low note, the sound just collapses into a wash of barely audible fuzz. Am I having electronic troubles? Do I need to replace the speaker?
 
hi,

The problem is somewhere in my amp, I guess. I bought a new cable and last weekend I played my bass through another guy's amp, and it sounded fine.

It's a tube amp, if that helps. I read a posting where they recommended replacing capacitors and/or tubes when your amp develops ''farting'' problems, which may be akin to the problem I have.