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Interesting sets. I think what I would do is look up the heater voltage of each tube and add them up, assuming the tube heaters are in series. Do they add up to something close to 120 volts? If not, and lower, some resistance would be needed, to figure later. You'd need the schematic, too, or do some circuit tracing. Then I'd bypass the power resistor completely and put a voltmeter across the heater terminals of one of the tubes, and plug the set into a variac. Slowly increase voltage until the voltage on the heater is up to spec. Check other voltages such as B+. Radio should play at that point and if you're lucky, the mains voltage going into the radio from the variac would be 120 or something close. If the variac voltage turned out to be less than 120 volts, then you could figure on a new dropping resistor for the set.
If you don't have a variac, you could use a light bulb in series with the AC line to the set. Start with a 40 watt bulb, check your heater voltage, and then try larger and larger bulbs, always checking heater voltage. Good luck! And wear rubber shoes and keep one hand in your back pocket working around live AC/DC sets.
Reece
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Reece
Perfection is hard to reach with a screwdriver.
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