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I will do some research for you. I just got done restoring a Zenith radio similar to that style for titan1A on this site. His is a 7S232 chassis. He (Rick titan1A) found a place to order a solid state plug in tube to replace the 6X5, and also a belt material to use to replace the tuning belt, without having to disassemble the entire tuning mechanism. I will do some research and see if I can come up as to where I ordered this items from. I don't suggest using a 6X5, as if the tube shorts heater to cathode it most likely will take out the power transformer. Wiring diodes should work out fine also, but yes, you will need some type of resistor in series to prevent the surge and also to drop some excess voltage. Personally I don't think light bulbs are a good choice.
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