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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.
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.
Garage sale Ohio, U.S. US$8 (equivalent to $10.62 in 2023) 2012: US$26,250 (equivalent to $32,629 in 2023) 2017 26.27-carat diamond ring [7] Car boot sale London, UK: £10 (thus sometimes called the Tenner Ring) 1980s: £657,000 (equivalent to £873,078 in 2023) 2017 Yongle Emperor-era lotus bowl [8] Yard sale Connecticut, U.S.
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.
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 ...
The Neutrodyne receiver, invented in 1922 by Louis Hazeltine, [133] [134] was a TRF receiver with a "neutralizing" circuit added to each radio amplification stage to cancel the feedback to prevent the oscillations which caused the annoying whistles in the TRF.
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 ...
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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