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Future TV variac advice: DO NOT pull the H oscillator tube(!), pull the H output tube instead (if series string pull the top cap or better yet clip only the heater leads in with clip leads).
If the output gets no signal from the osc, then the output will red-plate when that happens for more than ~10 seconds you will ruin the (often pricey) output tube, or weaken it greatly, and if you run it longer you put other sometimes unobtainium parts like the flyback at risk of destruction.
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