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6L6
The 6L6 is a beam-tetrode in a metal enclosure, developed in the mid-1930s by RCA for use in (audio) power amplifiers. It is believed to be the first true aligned-grid beam tetrode to have become available commercially in 1935. The design of the beam tetrode circumvents certain Philips power pentode patents [1]. During and after WWII, the 6L6 was a popular valve for the PA-stage of a (clandestine) short wave transmitter. The glass variant of the valve is known as 6L6G. The 6V6 is a derivative of the 6L6. It has the same pin layout, but produces less output power.

 6L6 datasheet

Pinout as seen from the bottom of the valve

6L6 on this website
British spy radi set Type 3 Mark II, also known as the B2
B2
American spy radio set SSTR-1 of 1942
AP-5 spy radio set, developed by the Poles in the UK
Tensor 4-piece spy radio set (USSR)
BCRA transmitter
Telefunken ESK-52 (made the French intelligence services)
Variants
Only the initial version of the 6L6 had a metal enclosure. All other versions had a glass body (denoted by the letter 'G' in the model number). Over time, several variants of the 6L6G were released with increased specifications, in particular a higher plate voltage. Known variants are:

  • 6L6
    Original metal version
  • 6L6G
    Glass version
  • 6L6GX
  • 6L6GA
  • 6L6GAY
  • 6L6WGA
    5932
  • 6L6GB
  • 6L6GC
  1. W = Designed to withstand greater vibration and impact.
  2. Y = Micanol used as insulating material for the base.

Equivalents
  • CV1948
  • VT-115
  • 6P3P
References
  1. Wikipedia, 6L6
    Retrieved June 2021.
Further information
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© Crypto Museum. Created: Monday 10 May 2021. Last changed: Monday, 14 March 2022 - 19:41 CET.
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