File:Ultraudion tube.jpg
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English: An Audion tube, the first vacuum tube that could amplify. The first triode, it consists of a partially evacuated glass tube with three electrodes inside: a filament, grid, and plate. About 2 inches (5 cm) in diameter. The Audion was invented in 1906 by American engineer Lee De Forest. This type, called an "Ultraudion", manufactured by De Forest for a few years beginning in 1910, was designed for use in regenerative radio receivers. It has two filaments located in the center of the tube, so that when one burned out the "spare" could be used. The grid consists of two flat wire screens on either side of the filament, and the plate consists of two square sheet metal plates outside the grids. The filament was connected to the screw terminal at top, while the grid and plate were connected to the wires brought out at the bottom.. The residual air left in these early "soft" audion tubes due to inadequate evacuation created ions that shortened the life of the filament, caused the tube to operate erratically, and gave it different characteristice than modern "hard vacuum" triodes. |
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| Source | Retrieved January 21, 2014 from The Independent, The Independent Corp., New York, Vol. 84, No. 3498, December 20, 1915, p. 474 on Google Books |
| Author | The picture is credited to Paul Thompson |
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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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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 04:44, 22 January 2014 | | 651 × 1,513 (138 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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