[Boatanchors] 6DQ5 6DQ5A difference?

[mac]

In "Tube Lore" Sibley says (concerning sweep tubes):

"Many of these tubes went through "A", "B", etc variants.  The  
differences are usually trivial (sealing tip on the base, vs. on the  
top), but occasionally significant (increased dissipation rating)."

Sibley does not identify an "A" variant for the 6DQ5 as he does for  
the 6DQ6  where the 6DQ6A had an 18 W dissipation rating vs. 15W for  
the non-A version.  From this I would surmise that the 6DQ5A could be  
safely substituted for the non-A version but maybe not (always) a good  
idea the other way around.

Dennis D. W7QHO
Glendale, CA

***************

On Oct 24, 2010, at 2:09 PM, hwhall at compuserve.com wrote:

> Hello,
> Does anyone have specifications that indicate the difference between  
> the 6DQ5 and the 6DQ5A? I have not been able to find anything on  
> that. My RCA manuals don't even mention 6DQ5A & google seems to come  
> up blank too.  I'm suspecting maybe a bit more plate dissipation or  
> better mechanical stability but would like to know for sure.
>
> Thanks & 73,
>
> Wayne
> WB4OGM
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