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Pin 4 seems to be the common heater voltage, it jumps between tubes. Continuity is good. Pin 5 goes to a disc cap, then to ground......
I could try replacing that disc cap I suppose.
Dosnt make sense. assuming 4 is "hot" 5 should go right to GND.
Check ohms should be 0 at pin 5 to GND.
May be a miswire here. If not sounds like the SKT.