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From the terminal side of the tube socket, starting at the wide space, and counting clockwise, pin 5 is the plate. You should have high DC voltage between the plate and the negative side of the filter caps. Using the schematic, follow the high voltage from the power supply section through every component until you arrive at the output tube plates. Something is open or shorted keeping power from those tubes.
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Reece
Perfection is hard to reach with a screwdriver.
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