RETMA tube designation

The Radio Electronics Television Manufacturers' Association was formed in 1953, as a result of mergers with other trade standards organisations.

It was principally responsible for the standardised nomenclature for American vacuum tubes.

American made tubes bear a RETMA designation to allow for easy cross-referencing. The RETMA tube designation does not incorporate the purpose of each tube in the designation. The Anglo-European Mullard-Philips tube designation does include tube use information in the designation.

Occasionally the same letter groups were used for differing tubes but only where the last number would be different making the designation unique. For example there is a 12AV5 (beam tetrode), 12AV6 (double diode, triode) and a 12AV7 (double triode).

In the case of a CRT, the second figure group indicates the type of phosphor the tube face was coated with.

Additional letters:

References

  1. Brimar Radio Valve and Teletube Manual (Edition No. 7)

See also

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