![]() The TR-55 used the following transistors: Powered by four AA batteries, the TR-55 used a superheterodyne circuit incorporating two AF stages and covered the medium wave broadcast band. The TR-63 would not fit in existing shirt front pockets, so the company issued shirts with expanded pockets to salesmen so they could claim the product was "the world's first pocket sized transistor radio". Sony later signed a deal with New York importer Adolph Gross to distribute an improved and slightly more compact model, and in March 1957, the Sony TR-63 transistor radio would become Sony's first product sold in the US. Bulova agreed to order 10,000 units on the condition they carry the Bulova name. In the fall of 1955, Morita met with a representative of the Bulova watch company in New York City. The TR-55 featured the Sony name, but the company did not officially change its name to Sony until January 1958. When the TR-55 was released in Japan in August 1955, it was the first transistor radio marketed in that country. The first model was called TR-52, but was pulled from the market before it had even been introduced after climbing summer temperatures made the front lattice section to gradually peel away from the black cabinet, forcing the company to build a new model using a more durable material. The use of transistors allowed the device to be much smaller than earlier vacuum tube radios.Īkio Morita and Masaru Ibuka, then operating under the business name Tokyo Tsushin Kogyo, had been working on plans to introduce a transistor radio to the market since 1953. The TR-55, released in 1955, was both Japan's and Sony's first commercially available transistor radio.
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