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Image: Audion receiver

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Description: An early audion radio receiver built by the inventor of the audion vacuum tube, Lee De Forest, around 1914. The audion, the first triode, was the first electronic tube that was able to amplify. Although invented in 1906, the amplifying ability of the audion was not recognized until 1911-1912, so this was one of the first amplifying radio receivers. It appears in a paper by De Forest demonstrating to his fellow engineers that the audion was not just a radio detector but also had the ability to amplify a signal.
Title: Audion receiver
Credit: Downloaded 03-26-2013 from Lee De Forest The Audion - Detector and Amplifier in Proc. of the Inst. of Radio Engineers ( Institute of Radio Engineers, NY) Vol. 2, No. 1, March 1914, p.18, fig. 4 on Google Books
Author: Lee De Forest
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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