Hook up to a expendable pair of speakers and gently wiggle each tube and you will likely find a bad socket. The tube which swims the most is likely the bad site. Also, look for leaky capacitors, brown goo, oozing from the end. Jallen
tube amp noise
I have an integrated tube amp and recently started noticing a small popping noise coming from the speakers once in a while. If I get near the tweeter (< 1'), I hear a background hiss and a small pop every minute or so. Most of the time, the pop sound can be only heard less than a foot or two from the tweeter. Is this normal tube amp behavior or is something wrong? I.e. do all tubes make any popping sound in addition to low level hiss? I changed tubes and still the same thing. Thanks for any help.