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

[odyslim at comcast.net]

 I have a few different manuals. The oldest states "no substitutions".
W WA or whatever. the newer manual which is dated April 1970 
does not mention the tube substitution and has the correct tube
listed as 6C4W.

 Scott W3CV


 -------------- Original message ----------------------
From: shoppa_r390a at trailing-edge.com (Tim Shoppa)
> "David Wise" <David_Wise at Phoenix.com> wrote:
> > 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.
> 
> Another numbering gotcha: 6CW4 might conceivably be confused with
> 6C4W. But it won't even come close to fitting in the socket!!!
> 
> But rather than guess what typos somebody else may have 
> made, this afternoon when I got home I put in
> 3 6C4W's and the radio works just fine (even bumping up against
> some of my local AM BCB intermod sources) with nearly identical
> S-meter reading (1 to 2 db higher) than the few-months-installed (and 
> 50 year old) 6C4's I had in there.
> 
> So my uneducated but empirical conclusion: whoever wrote that
> 6C4W's won't work was obviously mistaken.
> 
> Tim.
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