i have an older peavey classic 30 that keeps fucking up. normal low volume use often had crackles and pops sometimes but it doesn't seem like too much of an issue until....it become Very Much an issue and very loud bangs and crackles started and one of the tubes looked like it had lightning inside of it. so i replaced the tubes, no biggie. then it happened again quite quickly with the new set, so i just replaced the problem tube. now it has happened again to a different tube and im fucking sick to shit of it.
what do i do beyond 'take it to a tech'
is this a bias issue? fixable? or is the amp just fucked
thanks in advance for help, sorry if this is the wrong section