[R-390] 6C4? 6C4W? 6C4WA?

[Tim Shoppa]

As long as we're talking about 6C4 types, I see in the mailing list
archives a note from many years ago about the 6C4A being "Bad".

As far as I can figure out, the 6C4A is a transliteration from a Russian
tube type that is also a general purpose triode, but with a rather
different
pinout. The tube itself is not marked 6C4A but the Cryllic letters are
sometimes transliterated that way (I can't type Cryllic but what is
supposedly a
C looks more like a greek mu, and the A is more like a greek pi,
sometimes
this is transliterated into a "P"). These have
shown up on E-bay from the well-known Ukranian sellers and there they
note that they are not the same base as 6C4's!

It's vaguely possible that the FAQ has applied yet another layer of
indirection on this.

Tim.