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Image: Regency transistor radio

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Description: Regency TR-1 transistor radio, the first commercial transistor radio, which debuted October 18, 1954. Designed by Texas Instruments and IDEA, the TR-1 had a superheterodyne circuit with only 4 transistors: a combined local oscillator/mixer, two IF amplifiers, and one audio amplifier. Within one year of release, TR-1 sales approached 100,000. The transistor radio was the most popular communications device in history, with billions manufactured during the 1960s and 1970s. Courtesy of Steve Kushman.
Title: Regency transistor radio
Credit: Photo by uploader, taken at The History of Audio: The Engineering of Sound, an exhibition of the San Francisco Airport Museums[1] in SFO Airport, Terminal 3 from 2006-09 to 2007-05.
Author: Gregory F. Maxwell <gmaxwell@gmail.com> PGP:0xB0413BFA
Permission: GFDL-1.2
Usage Terms: GNU Free Documentation License 1.2
License: GFDL 1.2
License Link: http://www.gnu.org/licenses/old-licenses/fdl-1.2.html
Attribution Required?: Yes

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