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I'm not sure if the original vibrator step up transformer can operate at 60Hz, think vibrators of the day ran faster than that. But if this transformer can do 60Hz, you might be able to run this radio off a big "wall wart" 6V or 12V AC transformer. You'd remove the vibrator, and jumper out one side of the vibrator switch contacts. But I think that this transformer wants to see 100Hz or higher, and not like 60Hz. In that case, just remove the transformer and vibrator, and keep the rectifier tube. Hopefully, there's enough room to house a regular 60Hz power transformer that produces heater power and B+.
A less safe approach would be to convert the radio to a hot chassis design. If, and it's a big if, the circuits inside are not tied directly to the chassis (this might have been done to make the radio useable in a positive ground car and in a negative ground car). You'd change the tubes to their 12V equivalents, and the audio output to its 50V heater equivalent, and the rectifier to the usual hot chassis rectifier circuit.
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