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Smaller in size than "boat anchors", "glowbug" is a term used by US amateurs to describe a simple home-made tube-type radio set. The majority of glowbug transmitters are designed to be used in the CW radiotelegraphy mode. [21] Glowbug transmitters having simple, tube-based designs were part of many beginner ham stations.
These tubes were used as RF power amplifiers in some of the SCR-274 and AN/ARC-5 "command set" transmitters of WW2. Postwar, 1625 tubes flooded the surplus market, and were available for pennies apiece. Surplus 1625s found some commercial use, notably the use of a pair as modulator tubes in the Heathkit DX-100 amateur transmitter.
Valve Amplification Company (VAC) is a U.S. supplier of high end audio electronics, principally utilizing vacuum tube technology. It was founded in 1990 by Kevin Hayes (b. 1959) and Channing W. Hayes (1923–2009).
A valve RF amplifier (UK and Aus.) or tube amplifier is a device for electrically amplifying the power of an electrical radio frequency signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s, initially for receivers and low power stages of ...
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 ...
Homebrew is an amateur radio slang term for home-built, noncommercial radio equipment. [1] Design and construction of equipment from first principles is valued by amateur radio hobbyists, known as "hams", for educational value, and to allow experimentation and development of techniques or levels of performance not readily available as commercial products.