Noun
audion (plural audions)
English Wikipedia has an article on:audionWikipedia
An early electronic amplifying tube consisting of a partially evacuated glass tube with three electrodes, a heated filament, a grid, and a plate.
After the turn of the century it was found that negative resistance mercury lamps could amplify, and they were used. citation The invention of audion tube repeaters around 1916 made transcontinental telephony practical. Source: Internet
Alan and Steven Freeman: The Crack in the Cosmic Egg, Audion Publications, 1996, ISBN 0-9529506-0-X But it was only later that traditional instruments were disbanded altogether in favour of pure electronic free improvisation. Source: Internet
Sungook Hong, Wireless: From Marconi's Black-box to the Audion, MIT Press, 2001. page 20-22 Marconi's experimental apparatus proved to be the first engineering-complete, commercially successful radio transmission system. Source: Internet
In 1906, Lee De Forest brought out a vacuum tube device which he called the " audion ". Source: Internet
In its Audion leaflets, the De Forest company even warned against any operation which might lead to too high a vacuum. Source: Internet
John Ambrose Fleming (1906) In 1906, Lee De Forest of the US added a control "grid" to the valve to create a vacuum tube RF detector called the Audion, leading Fleming to accuse him of copying his ideas. Source: Internet