[Milsurplus] [Boatanchors] WYB: Octal triode 6C4 or 6S4 - I meant WTB WTT:6C4S or 6S4C

[WA5CAB at cs.com]

Richard,

There are several octal base rectifiers with directly heated cathodes.  
5R4, 5U4, 5Y3, etc.   (5Y3 violates the nomenclature assignment guidelines),  
However, I didn't intend to imply that there were a lot of them, merely to 
illustrate how the system was supposed to work (but didn't always).

In a message dated 10/14/2011 23:01:46 PM Central Daylight Time, 
1oldlens1 at ix.netcom.com writes: 
> ----- Original Message ----- 
> From: <WA5CAB at cs.com>
> To: <boatanchors at mailman.qth.net>; 
> <milsurplus at mailman.qth.net>
> Sent: Friday, October 14, 2011 7:57 PM
> Subject: Re: [Boatanchors] WYB: Octal triode 6C4 or 6S4 - I 
> meant WTB WTT:6C4S or 6S4C
> 
> 
> >OK.  Someone already said once that a 6C4 is a 7-pin 
> >miniature (which is
> >true) and that a 6S4 is 9-pin (I don't happen to know the 
> >tube and didn't
> >check but it probably is).  But even without looking up 
> >the tubes in a tube
> >manual, neither one could possibly be an octal triode 
> >unless it had a directly
> >heated cathode.  Which AFAIK were not built with 6.3 volt 
> >heaters.
> 
>      I suspect the 6C4 is actually a 6C5, which is a metal 
> octal triode often used as an oscillator tube. Not sure 
> about the other tube but it might be a 6S7 which is an octal 
> remote cut-off pentode with a grid cap similar to a 6K7 but 
> with a low current heater. But, there is also a 6S6, a 
> semi-remote cut-off pentode, and a 6S5, an octal base 
> magic-eye tube. There may be others my old handbooks don't 
> show. I don't think I have any of either. The 6C5 at least 
> was a fairly common tube and should not be too difficult to 
> find. If the other is, in fact, a 6S7 a 6K7 would probably 
> work provided the heater supply won't be overloaded.
>      FWIW I could find only one tube, the 6B4G, with an 
> octal base and filamentary heater. There may be others but 
> they must be very obscure.
> 
> 
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com 
> 

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