I power amp up and let it warm up. Take it out of standby and use it. Put it back in standby and it pops,crackles and makes all kinds of noise. Pops when I power off. Pops when I plug guitar in and out ,when not in standby mode. Are the rocker switches bad? Tubes ? Thanks.
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JCM 900 4100
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The circuit board in the rear of the amp, where the speaker jacks are...
tends to arc and burn. I have seen a hole, burned right through the board.
As you can see, somebody already cut the carbon spot out of this amp...
I'm afraid this amp has a "hot spot" on that board. Seen several burn right in that spot.
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