#1
The old Marshall JCM 30 that I use at my church started freaking out today while i was playing it. It makes crunching/popping noises and will get loud or quiet at random. We checked the hardware but there's no loose wires and nothing that was obviously wrong with it, we checked the cables I was using and it wasn't that either. What do ya'll think could be wrong with it?
#2
how long has it been since the power tubes were changed and biased?
"The fool doth think he is wise, but the wiseman knows himself to be a fool." - W.S.
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#3
We got it back from the shop a few months ago with new tubes so I don't think it's those.
#4
it could be a faulty input on the amp or guitar, or just a crappy cable if its not the tubes
#5
just to rule it out, watch the tubes the next time it starts doing that, and see if anything is shorting or arcing. Even new tubes can go bad, it's not the most reliable technology.
"The fool doth think he is wise, but the wiseman knows himself to be a fool." - W.S.
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#6
its your preamp tubes....change all of them...there cheap...9 bucks a piece.

popping and cracking and volume cutting in and out = bad preamp tubes.
Quote by deg0ey
The best pickups for emo are no pickups at all...


Gear:

1996 Les Paul Classic w/ Alnico II's
Marshall Jubilee 2550
Avatar 2x12..V30 and G12H
Vox V847 Wah
Assorted pedals