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In the early 1920s, Philco made storage batteries, "socket power" battery eliminator units (plug-in transformers), and battery chargers. With the invention of the rectifier tube, which made it practical to power radios by electrical outlets, in 1928, Philco entered the radio business. [2]
Chrysler and Philco announced an all-transistor car radio in the April 28, 1955, edition of the Wall Street Journal. [1] This Philco car radio model was the first tubeless auto set in history to be developed and produced. [2] It was a $150 option for 1956 Chrysler and Imperial cars and hit the showroom floor on October 21, 1955. [3] [4] [5]
A Philco 90 "cathedral" style radio, circa 1931. Although some households owned one or more sophisticated table radios or console models with shortwave and radio-phonograph combinations as early as the 1920s, table radios offered in various cabinet materials and designs at an assortment of prices from $10 to over $100 proliferated in the 1930s.
This 1920s TRF radio manufactured by Signal is constructed on a breadboard Tuning a TRF receiver, like this 5 tube Neutrodyne set from 1924 with two stages of RF amplification, was a complicated process. The three tuned circuits, controlled by the 3 large knobs, had to be tuned in unison to the new station.
The term All American Five (abbreviated AA5) is a colloquial name for mass-produced, superheterodyne radio receivers that used five vacuum tubes in their design. These radio sets were designed to receive amplitude modulation (AM) broadcasts in the medium wave band, and were manufactured in the United States from the mid-1930s until the early 1960s.
CBS Radio Mystery Theater; Earplay; The Firesign Theatre; The Fourth Tower of Inverness; Further Adventures of Sherlock Holmes; The General Mills Radio Adventure Theater; Hollywood Theater of the Ear; Imagination Theater; NPR Playhouse; NPR's serialized adaptations of Star Wars, The Empire Strikes Back, and Return of the Jedi; A Prairie Home ...
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