Okay, well, the new Mixer/Oscillator tube came in today. I swapped that and have been running it with the back on for hours now. Haven't had a single issue, everything seems rock solid, and it considering the previous behavior it would have started acting up by now. So I'm going to say I had some sort of intermittent issue with that tube. I may swap the old one back in later and see if the failure comes back, just to prove it, but so far so good.
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To keep your tubes running smoothly, make sure to dust underneath the glass as well.
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