Quote:
Originally Posted by davebelcher98
...sometimes when I turn on the amp, the filaments of that tube don't fire up, or other times, when I am playing for a bit, that tube will kick off (I can hear a noticeable difference both in volume and in tone -- becomes very flubby) -- when I check the power tube, sure enough, the filaments aren't glowing, and it's cold. I know the tube itself is fine.
Is this most likely a bad tube socket, or do I have to expand my options to a possible bad place in the circuit connected to this output tube? As simple as a loose solder joint?
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Try spraying the pins of the tube with contact cleaner and run the tube in and out a few times. If the tube goes in real easily, you might need to tighten the prongs inside the socket. Be sure to discharge before sticking metal objects in that socket. If that doesn't do it, the solder joints at pins 2 and 7 need to be re-flowed.