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File:Cylindrical Audion, made by Lee deForest's laboratory, c. late 1910s-1920s - National Electronics Museum - DSC00106.JPG

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English: Late Audion (triode) vacuum tube, made by Lee De Forest, who invented the Audion in 1906. The Audion was the first vacuum tube which could amplify. This is a later model from the mid-1920s, as indicated by the silvery getter coating on the inside of the glass envelope. As stated on the base, the De Forest Co. was only allowed to sell tubes to amateurs; De Forest had sold the commercial rights to the tube to Western Electric. Exhibit in the National Electronics Museum, 1745 West Nursery Road, Linthicum, Maryland, USA. All items in this museum are unclassified. The museum permitted photography without restriction.
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current23:05, 21 July 2014Thumbnail for version as of 23:05, 21 July 20142,133 × 4,081 (3.42 MB)Daderot (talk | contribs)User created page with UploadWizard

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