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An AC/DC receiver design is a style of power supply of vacuum tube radio or television receivers that eliminated the bulky and expensive mains transformer. A side-effect of the design was that the receiver could in principle operate from a DC supply as well as an AC supply. Consequently, they were known as "AC/DC receivers".
In the 1950s a 5-element system (Russian: Государственный Стандарт "State standard" ГОСТ/GOST 5461–59, later 13393–76) was adopted in the (then) Soviet Union for designating receiver vacuum tubes. [27] [28] The first element is a number specifying filament voltage.
Collins S-Line, featuring separate power supply, receiver, transmitter, and speaker console, c. 1960s. Amateur radio equipment of past eras like the 1940s, 50s, and 60s that are separate vacuum tube transmitters and receivers (unlike modern transceivers) are an object of nostalgia, and many see rehabilitation and on-air use by enthusiasts. [18 ...
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] [thermionic] valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
Akai produced consumer video cassette recorders (VCRs) during the mid-1980s. The Akai VS-2 was the first VCR to feature an on-screen display, [9] originally named the Interactive Monitor System. By displaying information directly on the television screen, this innovation eliminated the need for the user to be physically near the VCR to program ...
The tube is popular in hi-fi vacuum tube audio as a low-noise line amplifier, driver (especially for tone stacks), and phase-inverter in vacuum tube push–pull amplifier circuits. It was widely used, in special-quality versions such as ECC82 and 5814A, in pre-semiconductor digital computer circuitry.
[1] [17] Hull's first dynatron oscillator in 1918 used a special "dynatron" vacuum tube of his own design (shown above), a triode in which the grid was a heavy plate perforated with holes which was robust enough to carry high currents. [2] This tube saw little use as standard triode and tetrodes could function adequately as dynatrons.
A TRF receiver using a grid leak detector (V1) Early applications of triode tubes (Audions) as detectors usually did not include a resistor in the grid circuit.[3] [4] [5] First use of a resistance in the grid circuit of a vacuum tube detector circuit may have been by Sewall Cabot in 1906.