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File:Moorhead electron relay tube.jpg

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Description
English: An early triode, the Moorhead electron relay, was manufactured by Otis Moorhead beginning in 1916 as a copy of the Cunningham "Audiotron", under Lee De Forest's Audion patents. This version is from around 1919. It is a "soft" vacuum triode like the Audion, with some residual air left in the tube. The ionization of the gas when a voltage was applied gave it greater sensitivity as an AM detector, but limited the plate voltage so it couldn't produce much power. It consisted of a partially evacuated glass tube with a tungsten filament down the center of the tube, surrounded by a helical wire grid, surrounded by a cylindrical aluminum plate.
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Source Retrieved October 14, 2013 from Ellery W. Stone (1919) Elements of Radiotelegraphy, D. Van Nostrand Co., New York, p. 252, plate 33 on Google Books
Author Ellery W. Stone

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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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