Quote:
Originally Posted by Gogar
Swap positions until you have 2 "funky tubes" in s single channel and determine if the noise moved to "only" that channel.
In addition just "exercise" the sockets a little bit, could just be a little dirty.
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This.
You can also isolate the worst offenders by lightly tapping the tubes with a soft object while the amp is on, but no music playing. Start with the volume really low.