[Hallicrafters] Short metal tube mystery

[Charlie T, K3ICH]

If I remember correctly, the squatty little 717A is a sub for a 6SG7, but 
the only ones I've ever seen were glass envelopes, not metal.  I used one in 
my SX-99 RF stage.  Not sure if it really made a difference.   Maybe it's 
AGC charisticts were just different.

73' Charlie k3ICH


----- Original Message ----- 
From: <mikeqrpfun at aol.com>
To: <hallicrafters at mailman.qth.net>
Sent: Wednesday, October 27, 2010 9:54 PM
Subject: [Hallicrafters] Short metal tube mystery


>
>
> 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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