File:De Forest Audion.png
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English: Early Audion, the first amplifying vacuum tube, invented by Lee De Forest in 1906. The scale is in inches. It consists of three electrodes placed close together inside a partially evacuated glass envelope: a filament (left) consisting of a fine "U" shaped wire heated red hot by an electric current, a metal plate or anode (right), and a zigzag wire grid (center) between them. The filament wires were connected to the screw contact at top, while the grid and plate were connected to the external circuit through the wires emerging from the bottom. Residual air left in the tube created ions that gave the Audion different characteristics from modern "hard vacuum" triodes: increased nonlinearity made the Audion a better rectifier of radio signals, but limited the plate voltage to about 20-30 V so it was not capable of high power. After "hard vacuum" triodes were developed in 1913, the "soft" Audions were limited to use as radio receiver detectors. |
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| Source | Retrieved 1 October 2013 from John Ambrose Fleming (1922) Wireless Telegraphy and Telephony, I. Pittman and Sons, New York, plate 17, facing p. 128 on Google Books |
| Author | John Ambrose Fleming |
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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 | |
|---|---|---|---|---|---|
| current | 03:37, 13 October 2013 | | 295 × 459 (56 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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