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High screen voltage usually points to excessive load on the flyback/ HV side of the tube, and low screen voltage usually points to low secondary load.
If you have a B&K 1077 analyst it might shed some light using it's plate drive to power the flyback. And check boost with the tripler unhooked then later with the yoke unhooked.
It could be bad tripler or possibly bad yoke... I recently had bad yoke on a B year hybrid...HV would be okay then slump to nothing over the course of 15 minutes.
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