File:Grid leak resistor 1926.jpg
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Summary
| Description |
English: An antique grid-leak resistor and capacitor unit used in vacuum tube radio receivers from an advertisement in a 1926 radio magazine. It consists of a cartridge shaped replaceable 2 megohm resistor in a holder and a mica capacitor built into the base of the holder. It was used in grid-leak detector stages, an obsolete circuit used in tube radio receivers until the 1930s. The resistor and capacitor were connected to the grid of the tube and served as a biasing circuit. The resistor was replaceable so hobbyists could try different values of resistance to get the right one. |
| Date | |
| Source | Retrieved November 11, 2015 from Radio Engineering, M. B. Sleeper, Inc., Albany, New York, Vol. 6, No. 4, April 1926, p. 171 on http://www.americanradiohistory.com |
| Author | Anonymous |
| Permission (Reusing this file) |
This image is from an advertisement by Aerovox without a copyright notice published in a 1926 US magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain. |
Licensing
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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:52, 2 August 2016 | | 331 × 271 (16 KB) | Chetvorno | User created page with UploadWizard |
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