2013 Advent Calendar Day 5

RCA Ribbon Microphone

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In the early 1920s, Drs. Walter H. Schottky and Erwin Gerlach co-invented the first ribbon microphone.
A few years later, Dr. Harry F. Olson of RCA started developing ribbon microphones using field coils and permanent magnets. The RCA Photophone Type PB-31 was commercially manufactured in 1931 greatly impacting the audio recording and broadcasting industries.

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