I have a nice Tremoverb combo, outfitted with JJ tubes. I am playing tonight and the tone is as usual, great. My Strat really sounds superb on the clean channel. I have had the amp on for about five minutes and there is a little pop and the amp sounds way distorted and lots of fuzzz... Something is wrong. So, i place the amp into the standby mode and back to active and now the sound is more or less ok, BUT the amp seems down on power and if i move it, there is this weird hissing noise. Looks like i will have to visit a tech, but am I right in guessing that a tube is giving up the ghost and yet is still hanging in there. OTOH, would a cap potentially show this kind of issue?