The introduction of the TR-55 marked the rebirth of the radio as a portable device. The radio's amplifier circuit was built around four point-contact transistors made by Intermetall, which Herbert Matare and businessman Jakob Michael had founded in 1952. Tokyo Tsushin Kogyo (the original name of "Sony") was the first company in the world to make a radio using its own transistors. At the Dusseldorf Radio Fair in 1953, the German firm Intermetall unveiled what was probably the world's first transistor radio, more than a year before Texas Instruments claimed that milestone. Westinghouse H-374T5 Clock Radio (1952) 155.00 (Sold Dec 2016) Westinghouse H380T5 125.00 (Sold Aug 2011) Westinghouse H-380T5 (1953) 125.00 (Sold Jan 2018) Westinghouse H382T5 (1953). In 1955, the company began full-scale production and sales of Japan's first transistor radio, the TR-55. On December 23 they demonstrated their device to lab officials and in June 1948, Bell Labs publicly announced the revolutionary solid-state device they called a transistor. At the time, many people thought it was foolhardy to build a radio using transistor, but they overcame many obstacles and succeeded in developing Japan's first PNP alloy transistor prototype in 1954. Bardeen and Brattain applied two closely-spaced gold contacts held in place by a plastic wedge to the surface of a small slab of high-purity germanium. In 1952, when Sony's founder, Masaru Ibuka learned that Western Electric was going to release its transistor patents to the public for a fee, he decided to take on the challenge of developing a radio using Sony's own transistors. The whole family would gather in the room where the radio was located to listen to the news and music programs. At that time, radios were large and used vacuum tubes. Slade, of the Tube Department of Radio Corporation of America, wrote a series of articles on transistor development for three 1952 issues of Radio & Television News magazine. For Dyna-Mite Pocket Radio Kit, From Popular Science Magazine, November 1952 (14484308666). RCA had demonstrated a prototype transistor radio as early as 1952 and it is likely that they and the other radio makers were planning transistor radios of. It was the radio that provided accessible entertainment during the chaotic post-war years. vintage pocket radio transistor, plastic red Stock Photo.
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