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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 6L6GT. 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
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)
  • CV1948
  • VT-115
  • 6P3P
  1. Wikipedia, 6L6
    Retrieved June 2021.
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Crypto Museum. Created: Monday 10 May 2021. Last changed: Saturday, 12 June 2021 - 06:15 CET.
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