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Philco radios were economical without sacrificing quality or durability. Like other makers of the era, they offered a wide line of radios beginning with five-tube sets all the way up to high-fidelity consoles with 20 tubes in 1937–38. Philco also made battery-powered radios which were by then called "farm radios", most of which had cabinets ...
Tubes used in AC-powered radio receivers of the early 1930s 2A3 – Directly heated power triode, used for AF output stages in 1930s–1940s audio amplifiers and radios. 2A5 – Power Pentode (Except for heater, electronically identical to types 42 and 6F6) 2A6 – Dual diode, high-mu triode (Except for heater, electronically identical to type 75)
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]
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.
The BP-10 proved so popular that Zenith, Motorola, Emerson, and other radio manufacturers produced similar pocket radios based on RCA's miniature tubes. [21] Several of these pocket radios were introduced in 1941 and sold until the suspension of radio production in April 1942 for the duration of World War II.
Philco SB100 surface-barrier transistor advertisement. The Philco high-frequency surface-barrier transistor was also the first transistor that was suitable for high-speed computers. Philco developed and produced a miniature transistorized computer called the "Transac" (models C-1000 and C-1100), for the Navy's jet fighter planes in 1955.
a detector, which extracts the audio signal from the radio carrier signal by rectifying it. optionally, but almost always included, one or more audio amplifier stages which increase the power of the audio signal. Leutz 9-tube receiver from 1927 clearly shows the component parts of a TRF set. Each RF stage is in a separate compartment.
A classic Emerson transistor radio, circa 1958. A transistor radio is a small portable radio receiver that uses transistor-based circuitry.Previous portable radios used vacuum tubes, which were bulky, fragile, had a limited lifetime, consumed excessive power and required large heavy batteries.
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