GB> toobs-add a mystery Sylvania to the list! :-)

[Scott Johnson]

The 5647 I am familiar with, it was used in the PRC-14 as well as a lot of
other radios of that era.  I have in my posession a Raytheon subminiature
tube pamphlet that I will attempt to find and copy for anyone that is
interested.  FWIW, a few years ago, George Fathauer of Antique Electronics
Supply in Tempe, AZ designed and sold a PCB 8-sub miniature tube radio that
used a single 22.5 V battery and a single D cell for the filament. I guess
he wanted to use some of the great pile of NOS subminis they had in stock.
Anyway, I will try to find the info.  In general, the CK series was designed
for hearing aids back in the forties and fifties.

73,
Scott
----- Original Message -----
From: "john" <johnmb at NC.RR.COM>
To: <BOATANCHORS at LISTSERV.TEMPE.GOV>
Sent: Sunday, August 17, 2003 5:06 AM
Subject: Re: GB> toobs-add a mystery Sylvania to the list! :-)


> While we're at it, I'll throw in one "mystery toob" of my own...
> it's  about an inch long and about 3/16th wide. 4 leads (a diode?)
> marked JHS5647 Sylvania.
>
> Ideas? Smallest tube I've ever seen....
>
> John
>
>
>
> At 09:14 PM 8/16/03 -0700, Jim Bowman wrote:
> >
> >Every so often I get a burst of optimism and ask if anyone has any info
> >on a couple of sub-minuature tube types I have. So far I've had no luck.
> >
> >These little tubes are made by Raytheon. One is a CK636. It is 3/8 in.
> >dia and about 1-5/8 in. long. It has 8 wire leads about 1-3/4 in. long.
> >The other is a CK637. This one is similar to the first, except it is
> >about 1-1/4 in. long and also has 8 leads. This CK637 must be a dual
> >triode; two sections are clearly visible and the 8 leads would cover two
> >sets of plate, grid and cathode connections, and the two filament leads.
> >If it was suitable, it might make a cute little regen.
> >
> >Does anyone have a clue to specs on these little guys? One of each tube
> >free to the first person who comes up with the Raytheon specs for them!
> >;^)
> >
> >73,
> >
> >Jim W7HPK
> >
> >
> >---
> >
> >Checked by AVG anti-virus system (http://www.grisoft.com).
> >Version: 6.0.507 / Virus Database: 304 - Release Date: 8/4/03
> >
>
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