[Drake] 6jb6 or Equivalent

[Larry Knapp]

As a followup to my previous posting.  The following web site has a article
authored by VE3EFJ on transmitting general.  If you scroll down you will find
the following subsections:  Transmitter tuning, A tubes and 6JB6.  Hope this
information is valuable.

http://www.dproducts.be/Drake_Museum/transmit.htm

73, Larry KC8JX
--- Larry Knapp <kc8jx@yahoo.com> wrote:
> 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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