EHT is something like Electrical High Tension as I recall. I'd vote for one or more of the EHT board/circuit, quadrupler, and/or splitter has gone bad. The EHT holddown circuit is intended to prevent the highvoltage from shooting up out of the controlled range and producing harmful x-ray radiation. I've seen a splitter go bad and damage the EHT circuits. On the other hand, I suppose one of the tubes could go bad and short out the EHT voltage and am guessing that it would cause the same thing.
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