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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.
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.
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] 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 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.