Jim Bowman jimbowman at SEANET.COM
Sun Aug 17 00:14:20 EDT 2003

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!



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