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The Regency TR-1 was the first commercially manufactured transistor radio. First sold in 1954, it was a novelty due to small size and portability; about 150,000 units were sold despite mediocre performance. The device demonstrated the use of transistors for consumer electronics; previously transistors had only been used in military or industrial applications. Surviving specimens are sought out by collectors. ==History== Two companies—Texas Instruments of Dallas, Texas, and Industrial Development Engineering Associates (I.D.E.A.) of Indianapolis, Indiana—worked together to produce the Regency TR-1. Previously, Texas Instruments produced instrumentation for the oil industry and locating devices for the U.S. Navy—and I.D.E.A. built home television antenna boosters. The two companies worked together on the TR-1 to grow revenues for their respective companies by pioneering this new product area. In May 1954, Texas Instruments had designed and built a prototype transistor radio and was looking for an established radio manufacturer to develop and market a radio using their transistors. No major radio maker, including RCA, Philco, and Emerson, was interested. The President of I.D.E.A. at the time, Ed Tudor, jumped at the opportunity to manufacture the TR-1, predicting sales of the transistor radios would be "20 million radios in three years."〔 page 3〕 The Regency Division of I.D.E.A announced the TR-1 on October 18, 1954, and put it on sale in November 1954. It was the first practical transistor radio made in significant numbers. One year after the TR-1 release, sales approached 100,000 units. The look and size of the TR-1 were well received, but reviews of its performance were typically adverse.〔 page 4〕 The Regency TR-1 is patented by Richard C. Koch, , former Project Engineer of I.D.E.A. The Regency TR-1 circuitry was refined from the Texas Instruments prototype, reducing the number of parts, including two expensive transistors. Though this severely reduced the audio output volume, it let I.D.E.A. sell the radio for only a small profit. The initial TR-1 retail price was $49.95 (roughly $400 in year-2010 dollars) and it sold about 150,000 units. The TR-1 used Texas Instruments' NPN transistors, hand-picked in sets of four. A 22.5 volt battery provided power, since the only way to get adequate radio frequency performance out of early transistors was to run them close to their collector-to-emitter breakdown voltage. The current drain from this battery was only 4 mA,〔 allowing 20 to 30 hours of operation, in comparison to only several hours for the portable receivers based on vacuum tubes.〔Schiffer, M. B. The portable radio in American life. — University of Arizona Press, 1991. — P. 170-178. — 259 p. — ISBN 9780816512843〕 Such battery consumption rate still made the TR-1 rather expensive to run. While the radio was praised for novelty and small size, the sensitivity and sound quality were behind the tube-based competitors. A review in ''Consumer Reports'' mentions the high level of noise and instability on certain radio frequencies, recommending against the purchase.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Regency TR-1」の詳細全文を読む スポンサード リンク
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