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2. Antique radio - Wikipedia

   en.wikipedia.org/wiki/Antique_radio

   Homemade two tube radio from 1958. 1930s style homemade one-tube regenerative radio. The idea of radio as entertainment took off in 1920, with the opening of the first stations established specifically for broadcast to the public such as KDKA in Pittsburgh and WWJ in Detroit. More stations opened in cities across North America in the following ...

3. Rogers Vacuum Tube Company - Wikipedia

   en.wikipedia.org/wiki/Rogers_Vacuum_Tube_Company

   Rogers Vacuum Tube Company. Rogers Vacuum Tube Company (formally named Radio Manufacturing Corporation Limited) was founded as the Standard Radio Manufacturing Corporation in 1925 by Edward Rogers (1900–1939) to sell Rogers "Batteryless" radios using vacuum tube technology. [1] [2] It was later renamed Rogers Majestic Corporation Limited when ...

4. Sylvania Electric Products - Wikipedia

   en.wikipedia.org/wiki/Sylvania_Electric_Products

   Sylvania Electric Products. Sylvania Electric Products Inc. was an American manufacturer of diverse electrical equipment, including at various times radio transceivers, vacuum tubes, semiconductors, and mainframe computers such as MOBIDIC. They were one of the companies involved in the development of the COBOL programming language.

5. Elmer T. Cunningham - Wikipedia

   en.wikipedia.org/wiki/Elmer_T._Cunningham

   Elmer Tiling Cunningham (September 1, 1889 – June 14, 1965) was an American entrepreneur and businessman, specializing in vacuum tubes and radio manufacturing. He is best known for being the most successful business person to produce counterfeit (AKA bootleg) or unlicensed vacuum tubes (1915-1920). Cunningham was in direct violation by ...

6. WD-11 - Wikipedia

   en.wikipedia.org/wiki/WD-11

   The WD-11 vacuum tube, a triode, was introduced by the Westinghouse Electric corporation in 1922 for their Aeriola RF model radio and found use in other contemporary regenerative receivers (used as a detector-amplifier) including the Regenoflex and Radiola series. The WD11 and "RCA-11" [1] (and later simply named "11" by RCA [2] and Philips ...

7. Tung-Sol - Wikipedia

   en.wikipedia.org/wiki/Tung-Sol

   In 1941, many United States broadcast stations were using radio tubes by Tung-Sol as evident in literature provided with the broadcasters dial indicators. [21] In 1943, there is a data sheet with copyright on the 703A ultra-high frequency triode vacuum tube used for the Joint-Army-Navy contract NXSR-81414. [22]

8. Vintage amateur radio - Wikipedia

   en.wikipedia.org/wiki/Vintage_amateur_radio

   Amateur radio operator's "Radio shack" with vintage gear. Vintage amateur radio is a subset of amateur radio hobby where enthusiasts collect, restore, preserve, build, and operate amateur radio equipment from bygone years, such as those using vacuum tube technology. Popular modes of operation include speaking over amplitude modulation (AM), and ...

9. Swan Electronics - Wikipedia

   en.wikipedia.org/wiki/Swan_Electronics

   Herbert G. Johnson, W6QKI, founded Swan Engineering. Johnson built the first ten largely vacuum tube type design single sideband (SSB) transceivers in a garage in Benson, Arizona, in 1960-1961. The more expensive Collins KWM-2 was the only other competing transceiver at the time. The operation moved to Oceanside, California, where, at one point ...