I've been having this problem lately with my Epiphone Century amp. Basically what happens is the amp will be noise free and then randomly very loud static noises will begin to sound through the amp. It usually lasts about 10 seconds or so and then the amp makes a loud pop and the static goes away. I have a feeling it's a bad preamp tube but I'm not 100% sure, I also feel like I might have a cold solder joint somewhere in the amp. I just replaced my power tubes about 2 months ago so I don't think they are the problem.

Anyone have any idea what it could be?
sounds like you need new preamp tubes...
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This is terrible advice. Even worse than the useless dry, sarcastic comment I made.

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I'm too old for the Jim Morrison look now. When I was gigging I had a fine arse.