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This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics.
V-- Flash tubes; W-- Travelling wave tube; X-- X-ray tube; Y-- Thermionic converter; The last 2 digits were serially assigned, beginning with 21 to avoid possible confusion with receiving tubes or CRT phosphor designations. Multiple section tubes (like the 3E29 or 8D21) are assigned a letter corresponding to ONE set of electrodes.
The Radio Electronics Television Manufacturers' Association was formed in 1953, as a result of mergers with other trade standards organisations, such as the RMA.It was principally responsible for the standardised nomenclature for American vacuum tubes - however the standard itself had already been in use for a long time before 1953; for example, the 6L6 was introduced in July 1936.
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.
The main letters used in the second half of the twentieth century for receiving tubes were: D, E, G, L, P and U [8] although X was also frequently found when 600mA heater chain versions were produced for the North American market.
The pentagrid converter is a type of radio receiving valve (vacuum tube) with five grids used as the frequency mixer stage of a superheterodyne radio receiver. The pentagrid was part of a line of development of valves that were able to take an incoming RF signal and change its frequency to a fixed intermediate frequency , which was then ...
In the 1950s a 5-element system (GOST 5461-59, later 13393-76) was adopted in the (then) Soviet Union for designating receiver vacuum tubes.[4]The 1st element (from left to right) is (for receiving tubes) a number specifying filament voltage in volts (rounded to the nearest whole number).
The Tube Collectors Association; Datasheet on the 6SN7; RCA Receiving Tube Manual, RC-14, Harrison NJ, 1940; RCA receiving Tube Manual, RC-29, harrison NJ, 1973; Sylvania Technical Manual 14th edition (reprint), 2000; GE Techni-Talk, Volume 6 number 5, October–November 1954; Datasheet on the 6CG7; SPICE MODEL; Reviews of 6sn7 tubes.