[Boatanchors] Valiant 6146 Question

[Richard Knoppow]

----- Original Message ----- 
From: "Jim Wilhite" <w5jo at brightok.net>
Cc: <boatanchors at mailman.qth.net>
Sent: Wednesday, December 19, 2012 2:10 PM
Subject: Re: [Boatanchors] Valiant 6146 Question


> You made me think a bit more Glen.  I dug out my old ARRL 
> handbook that had tube specs in it and looked up the 6146. 
> The Interelectrode Grid 1 to Plate in the old tube is .22 
> pf and in my later book (c. 1970s) it is .24 pf.  The Grid 
> to cathode in the old is 13.5 and the newer version is 
> 13.0  The plate to cathode is 8.5 in the old and 8.5 in 
> the new.
>
> So there were redesigns of the tube later along accounting 
> for a small change in neutralizing and, as you describe in 
> the Collins equipment particularly, the cap was already 
> marginal.
>
> Jim
> W5JO

    It has been suggested that RCA should have sold the 
6146B under a different type number. There is little 
difference between the generic and A version but the B is 
really a different tube.
    W on a type number means only that it was made for a 
government contractor. W types may or may not have had 
special specifications.  It is sometimes possible to find 
out but often not.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com