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I have not. I ordered some spares a while back and they've been delayed. That being said, since this is an AA5 for all intents and purposes, I might could borrow some known good ones from my AM radio and see if that has any impact.
I think I have a signal generator set up somewhere. Would there be any value in checking my audio section with one? I know my speaker output is good since I'm getting some audio hum from it, so it has to be a breakdown somewhere in the signal line, right?
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To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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