[Hallicrafters] Short metal tube mystery

[Mack Rogers]

There were some small short metal tubes, the only one that comes to mind instantly is the 6H6 dual diode. I have a couple of old Navy rcvrs packed away that use these little metal tubes in some positions, can't recall the tube numbers right now?

Just imagine an old metal 6L6 cut down very short with a slightly domed top and you got it.

N4VGB
Mack Rogers





--- On Wed, 10/27/10, mikeqrpfun at aol.com <mikeqrpfun at aol.com> wrote:

> From: mikeqrpfun at aol.com <mikeqrpfun at aol.com>
> Subject: [Hallicrafters] Short metal tube mystery
> To: hallicrafters at mailman.qth.net
> Date: Wednesday, October 27, 2010, 9:54 PM
> 
> 
> Hi folks,
> My long time ham buddy (W6LPU) and I have been recently
> sharing SX-28 stories and would appreciate some insight from
> you experts. I recall as a teenager that my SX-28 housed
> small non-OEM metal tubes in the center shielded RF section.
> I recall they were electrically equivalent replacements to
> the ubiquitous 8 pin OEM octal 3" tall metal tubes (like the
> ones in my BC-348-Q) but these puppies were only about an
> inch tall with a slight dome on top.
> 
> They supposedly offered better performance than their
> taller brethren. My buddy isn't resonating with my
> recollection thinking instead I was recalling "loctals" that
> have a very short distance between the pins and the elements
> so that they could be used in the VHF spectrum. He said his
> SX42 uses them saying they were pretty much duplicates
> electric-wise of the 6SXX series except they were labeled
> 7XXX. 
>  
> Seems this same good old buddy gave me one of his SX-28A
> receivers a year ago that I am getting ready to restore and
> would greatly appreciate you fine folks clearing my"brain
> fog" and forward your recollections of this mystery tube
> series and perhaps some part numbers that I so vividly
> recall. 
> 
> 73 and thanks in advance,
> 
> Mike 
> WB6UTW
> 
> 
>  
> 
> 
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