[Drake] 6jb6 or Equivalent

[Larry Knapp]

Interesting last name considering we are discussing Drake radios.

I use 6JB6A's in my T4XB.  Don't think you will find much difference between
the 6JB6 and the 6JB6A.  Al, W8UT, has done quite a bit of research of these
tubes, manufacture and testing.  The following site has some good information:
http://www.dproducts.be/drake_Museum/abut6jb6.htm

There are differences in the shape of 6JB6's.  The RCA's I have and the
Sylvania's do have a different shape at the base.  Currently I have Sylvania in
my T4XB.  I have some Sylvania and RCA spares.  As to Raytheon making them even
though they have Sylvania or RCA on them, I would not know.  I thought I read
on some Drake site that Sylvania's were the 6JB6 of choice.  Perhaps others can
shed some light here....good discussion thread.

73, Larry KC8JX 

--- David Drake <drake@fullnet.com> wrote:
> Hi All !
> 
> I know this issue has been addressed at some point in the past, but I missed
> it and can't find it in my references.  The questions are: Drake, as I
> understand, only sold rigs with sylvania 6jb6 tubes.  What are the
> differences in brands?  I understand they were all made in the same Raytheon
> factory?  If so, why all the caution about re-neutralization?  I know it
> recommends it in the manual, and, I don't have any first hand experience with
> replacements.  Second, What issues are there with substitution with 6jb6a's. 
> If there is a web site that addresses this, please direct me to it and I can
> bookmark it.  I don't need to replace mine as yet, and hope I never do, but
> this has come to mind during my restoration of an old Westinghouse shortwave
> set (tube substituition).
> 
> Thanks,
> 
> David Drake, Wd9cmd, in Icy cold and nasty southern Indiana.


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