File:Single triode receiver 1924.jpg
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Summary
| Description |
English: Single tube triode radio receiver from 1924, with parts labeled. Invented by Lee De Forest with the triode around 1912, this was the earliest vacuum tube receiver. The tube serves as a grid-leak detector to rectify the radio signal to extract the audio modulation (sound) from it, and also amplify it. The grid leak, a megohm resistor and capacitor in parallel connected in series with the grid, served to bias the grid with a negative DC voltage near cutoff, so it only conducted current on the positive half cycles of the RF cycle. It used a UV-200 tube.
Alterations to image: changed two of the labels to be more informative, added image of vacuum tube from another picture (in original image the tube socket is shown empty). |
| Date | |
| Source | Retrieved November 19, 2015 from Radio In The Home magazine, Henry M. Neely Publishing Co., Philadelphia, Pennsylvania, Vol. 2, No. 5, October 1923, p. 14 on http://www.americanradiohistory.com |
| Author | Unknown author |
Licensing
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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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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:29, 28 December 2015 | | 603 × 601 (64 KB) | Chetvorno | User created page with UploadWizard |
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