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Since 1962, the microwave auditory effect or tinnitus has been shown from radio frequency exposure at levels below significant heating. [34] Studies during the 1960s in Europe and Russia claimed to show effects on humans, especially the nervous system, from low energy RF radiation; the studies were disputed at the time. [35] [36]
A classic Emerson transistor radio, circa 1958. A transistor radio is a small portable radio receiver that uses transistor-based circuitry.Previous portable radios used vacuum tubes, which were bulky, fragile, had a limited lifetime, consumed excessive power and required large heavy batteries.
The company's best selling products were often shortwave receivers, parts, and portable radios. In the 1960s, many Lafayette brand radios were rebranded Trio-Kenwood sets. A significant share of 1960s and 1970s vintage Lafayette hi-fi gear was manufactured by a Japanese subcontractor named "Planet Research".
The reflex receiver, invented in 1914 by Wilhelm Schloemilch and Otto von Bronk, [136] and rediscovered and extended to multiple tubes in 1917 by Marius Latour [136] [137] and William H. Priess, was a design used in some inexpensive radios of the 1920s [138] which enjoyed a resurgence in small portable tube radios of the 1930s [139] and again ...
Regency TR-1 transistor radio. The Regency TR-1 was the first commercially manufactured transistor radio, introduced in 1954.Despite mediocre performance, about 150,000 units were sold, due to the novelty of its small size and portability.
The speaker grille was made from punched aluminum, and its design was reportedly inspired by Lincoln Motor Company automobiles of the era. Although it was not as compact as originally intended, the relatively small size of the TR-55 was a novelty, and attracted the attention of Japanese consumers.
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The RCA model R7 Superette superheterodyne table radio. This is a list of notable radios, which encompasses specific models and brands of radio transmitters, receivers and transceivers, both actively manufactured and defunct, including receivers, two-way radios, citizens band radios, shortwave radios, ham radios, scanners, weather radios and airband and marine VHF radios.