[Ron Ramirez]

Bear in mind that unless you are using a 1000 ohm/volt voltmeter, as was used back in ye olden days, your voltage readings will be higher than that specified in the service data because today's modern multimeters are much more sensitive (reading in the megohms/volt) and therefore, do not load down the circuit under test as the old meters did that were used when the Model 20 was new.

That having been said, however, yes, the plate voltages of your RF amplifier tubes and audio output tubes are higher than I would expect.