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Audion pianolocked

  • Hugh Davies


Electronic keyboard instrument (not a piano) developed by Lee de Forest (b Council Bluffs, IA, 26 Aug 1873; d Hollywood, CA, 30 June 1961) in New York from 1915. De Forest introduced his Audion triode valve (vacuum tube) in 1906. A more sensitive development of John A. Fleming’s diode valve, it was to prove a major step in the development of electronics, especially radio. About ...

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