Stone Vintage Radio Museum - Antique Radios, Wireless, Crystal Sets, Tubes, and Valves

DeForest RJ4 from 1914 complete with a spherical audion. This is an original set, not one of the reproduction ones that are about. It was the first commercial radio made with a triode tube in the US. The audion was used as a detector instead of the more common crystal detector of the time.

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