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

[David Wise]

I just Googled around and found lots of references to "6C4P" (6S4P was
more common however) but no 6C4A.  I'm not ruling out that
transliteration, but I didn't see anyone using it.  In any case,
if someone plugs one in in place of an American-numbered 6C4, they
will be disappointed.  The numbering systems have nothing to do with
each other and any resemblance is a coincidence.

73,
Dave Wise

PS - I changed out a socket in my Marconi TF1370 Wide-Range
RC Oscillator to take a 6S45PE instead of the horribly expensive
3A/167M.  It works okay.

> -----Original Message-----
> From: r-390-bounces at mailman.qth.net
> [mailto:r-390-bounces at mailman.qth.net]On Behalf Of 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!