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Old 11th Dec 2022, 6:38 pm   #35
G6Tanuki
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Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
Default Re: Combined power-pentode and double-diodes?

If you want a really strange 'hybrid' valve, look at the EFM1 - a tuning indicator built into the same bottle as an audio variable μ pentode.

http://www.r-type.org/exhib/aaa0982.htm

What were they thinking??

It even had a follow-on!

https://www.radiomuseum.org/tubes/tube_efm11.html

using the strange German base with the pins non-synnetrically arranged round the central spigot.

That there were no Octal/Loctal/B8/B9 successors shows that such things failed to capture the imagination of radio-designers.
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