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Is it safe to assume you've replaced all the paper and electrolytic caps, as well as checked resistor values in the vertical circuit? That would be the first step. Not sure how you're getting 115V on pin 5(grid) of the 6V6, unless you're measuring AC volts? There should only be a 3.3 meg resistor going to ground and one end of a .1uf cap tied to that pin. Pins 2 and 7 are the heater supply and should have around 6.3Vac across them. Pin 6 has no internal connection to the 6V6 and must be a tie point for some other point in the circuit. Better double check the wiring around that stage.
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