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new vert out tube, no help, next will be a new vert osc. Darn it as a termistor in the vert height circuit, I hate those. From there it goes to the boost voltage, AND there is a .1 cap to ground. That would be a prime leaker.
May also explain the odd stuff going on at the shunt (a leaky one that gets worse with heat would kill the boost). that one will get subbed (I do that routinely on those white ceramic tube 1kv caps) they are about 50/50 on being good or bad with leakage. I am pretty sure they are just a paper inside.
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