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There is likely insufficient or no drive to the output tube!!!! Your cathode current is about 60mA above the maximum recommended for the tube if the cathode resistor is indeed 47 ohms as shown in the schematic, and you're indeed reading 8 volts across it. There should also be a negative voltage reading on pin 5 if your set is like most. That is grid bias developed by the drive signal. You need to check for defective components-- such as a trimmer capacitor shorted to ground or perhaps an open phase or width coil.... Recheck all components to make sure they are within spec, and none of the capacitors leaky.
Don't run the set long under these circumstances or you will be in the market for a new output tube. If the plate isn't glowing red intially it will start soon.
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