i was jamming around today and noticed that my 5150 Is making a strange noise. on all channels it has a knocking sound coming through the speakers. ive had the power tubes in for about 7 months and have been rolling different preamp tubes through it like I normally do for my amps. but this is new. any ideas?
How often does it do the knocking noise
I would guess preamp tubes. I had a similar problem and that was the fix. All it takes is 1 bad one.....and just because the tube was bought new doesn't mean it wasn't mishandled.
its a constant knock about 3 seconds apart