#1
My guitar amp didn't used to have this problem, but now it regularly gets a lot of static and I can barely hear the guitar. If I move the amp around or pound on it it usually starts working properly again. What might the problem be?
#2
Loose/dirty connections. Check the obvious stuff, like any in or output, including the power cable. Give it all a slight wiggle (except maybe the power cable, that could be dangerous) and also roll all your pots back and forth for any scratchiness.

Also, what amp?
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#3
Quote by Lavatain
Loose/dirty connections. Check the obvious stuff, like any in or output, including the power cable. Give it all a slight wiggle (except maybe the power cable, that could be dangerous) and also roll all your pots back and forth for any scratchiness.

Also, what amp?

It's a little tube amp, maybe 15w. I think it's a Crate.

I checked all the cables and tried different ones. Didn't fix it. What would scratchiness or lack thereof from rolling the pots tell you?
#4
You might try tapping on the individual tubes with the end of a pencil and see if that affects the static in any way. To me it sounds like you have bad power tube(s)
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#5
Also make sure the nuts around each input are tight. I had one go loose and my signal kept doing what you just said yours was.