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

The S. G. Brown Microphone Amplifier was first introduced in England in 1923. What is unique about it is that it is a mechanical amplifier. A magnetic disk allowed the adjustment of a reed mechanism to get the most volume. I restored the unit so that it would work, but the results netted little increase in volume.

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