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well, I think your old tube arced through the neck, to the yoke, like zeniths with that bad safety cap. That most likely cracked the tube, and gave you the short reading.
I bet your relay kicking on and off is the HV hold down circuit. If the voltage goes up, the set shuts off. but its only a guess. It was a thing on those sets around that date. Look for a long IC in the middle of the H and V circuitry, and look for a pin with either "hold down" or "0V" printed on it. If you can get the set to run, with the board set for you to measure the 0V pin, if it goes up, ground it temp, to see if the set comes on.
Take the number off that IC and get a pin-out, not as good as a schematic, but you can see the 0V pin.
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