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There was several different reasons why this proceedure was followed. The old cars only had a 6 volt system. There was no tubes that would work on that low of a plate or screen source. That 6X5 was no more troublesome that any of the other rectifier tubes, for that application. Philco used 7Y4 or 84, depending on the year. Some larger radios used syncronous vibrators that rectified by means of commutating contacts.
Government equipment used genemotors, as they didn't trust vibrators.
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