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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.
Amateur radio operator's "Radio shack" with vintage gearVintage amateur radio is a subset of amateur radio hobby where enthusiasts collect, restore, preserve, build, and operate amateur radio equipment from bygone years, such as those using vacuum tube technology.
The Neutrodyne radio receiver, invented in 1922 by Louis Hazeltine, was a particular type of tuned radio frequency (TRF) receiver, in which the instability-causing inter-electrode capacitance of the triode RF tubes is cancelled out or "neutralized" [1] [2] to prevent parasitic oscillations which caused "squealing" or "howling" noises in the speakers of early radio sets.
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Along with selling antiques, the Scotts are selling Fusion Mineral Paint in MJM Vintage Market. The store will be an exclusive retailer of the paint product and other assorted products in the line ...
Audio reproduction quality of TRF sets was limited by the available loudspeakers. "High Fidelity" was not to become a radio marketing concept until the mid-1930s and was not realized until the advent of FM broadcasting. Reaction sets, also known as regenerative receivers, rely on positive feedback to achieve adequate gain. This approach ...
NEWCOMERSTOWN ‒ The vehicles and equipment of the former Newcomerstown Emergency Rescue Squad, Inc. (NERS) are being sold through an online auction.. The auction, conducted by the company ...
An extraordinarily rare dime whose whereabouts had remained a mystery since the late 1970s has sold for just over $500,000. The coin, which was struck by the U.S. Mint in San Francisco in 1975 ...
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