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Let me get those voltages for sure right. They are referenced to the
cathode, yes???? So with the cathode at +75 the G2 should be at
75+250 = 325 and the focus should be adjustable around 2075, with
respect to ground.
The instability is perhaps due to bad resistors in the bleeder chain.
I will replace them today.
Close examination of the HV cable showed it to have cracked
rubber insulation. It was replaced.
I forgot to mention that the grid lead to the CRT was dead.
It used a very small wire, like #36 or so, presumably for
low capacitance. It was broken. I replaced it with #24 wire.
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