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The system assigned numbers with the base form "1A21", and this numbering scheme is occasionally referred to by tube collectors and historians as the "1A21 system". The first digit of the type number was 1-9, providing a rough indication of the filament/heater power rating (and therefore the overall power handling capabilities) of the tube.
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 type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot ...
39 – Remote-cutoff pentode, UX5 based (Commonly branded as 39/44). 41 – Power pentode, Early UX6 based version of octal type 6K6G, and Loctal type 7B5. 42 – Power pentode, Early UX6 based version of octal type 6F6G, Except for heater, similar to types 2A5 and 18. 44 – Similar to type 39, see type 39 above.
The ten digits of a GN-4 Nixie tube. A Nixie tube (English: / ˈ n ɪ k. s iː / NIK-see), or cold cathode display, [1] is an electronic device used for displaying numerals or other information using glow discharge. Inside a broken Nixie tube. The glass tube contains a wire-mesh anode and multiple cathodes, shaped like numerals or other symbols.
Mullard–Philips tube designation. In Europe, the principal method of numbering vacuum tubes ("thermionic valves") was the nomenclature used by the Philips company and its subsidiaries Mullard in the UK, Valvo (de, it) in Germany, Radiotechnique (Miniwatt-Dario brand) in France, and Amperex in the United States, from 1934 on.
12AX7 (also known as ECC83 [1]) is a miniature dual-triode vacuum tube with high voltage gain.Developed around 1946 by RCA engineers [2] in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 identifier on September 15, 1947.
V (Russian: В) – Vacuum tube with secondary emission. L (Russian: Л) – Nonode. Ye (Russian: Е) – Magic eye tube (e.g. used as a tuning indicator). U (Russian: У) – Power triode (was soon deprecated). The 3rd element is a number – a series designator that differentiates between different devices of the same type.
The 6V6 is a beam-power tetrode vacuum tube. The first of this family of tubes to be introduced was the 6V6G by Ken-Rad Tube & Lamp Corporation in late 1936, [1] with the availability by December of both Ken-Rad and Raytheon 6V6G tubes announced. [2] It is still in use in audio applications, especially electric guitar amplifiers. [3]