I noticed today that my amp is making like a fuzzy crackling sound. At first I thought it was a loose jack or something but it makes the sound when there is nothing plugged into the input.

Might this be caused by some tubes going bad?
Really, 311? Really?

I was just asking if it could be the tubes because I'm too lazy to do the pencil test or the "buy one tube and switch it out" test, lol.