Texas Instruments/DELCO automobile transistor radio, 1957. The invention of the transistor at Bell Labs in 1947 gave engineers a powerful new tool that they quickly adopted for new radio circuits. Portable radios based on vacuum tubes existed prior to the transistor but transistorized designs proved more durable and much more energy efficient. Transistor radios first went on sale in late 1954 and by the early 1960s many Americans owned one. Car radios also became more reliable as transistors were integrated into the design.
Vintage Transistor Radios
Delco's All-Transistor Auto Radio, August 1957 Radio & TV News
History of Transistors Museum
Original Radio Value Chevy Tri Five Forum
File:Vintage 1958 Oldsmobile Trans-Portable Car Radio By Delco, AM
Automobile Electrical and Electronic Systems, Third edition
1920s radio usa hi-res stock photography and images - Alamy
Vintage Car Radios for sale
phscollectorcarworld: 2019