I'd try another known good 3-500. What do you know about the tube
that's in there now? did it come with the amp when you bought it?
ever swap it out for another one? I know of people running these amps
too hard (too much grid current and/or plate current) and doing a
number on the tube. This is an easy thing to check provided you have
the use of another tube.
73
rob / k5uj
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