Fwd: Subminiature Pencil Tubes?

Rich Post postr at OHIOU.EDU
Thu Jun 24 11:24:19 EDT 2010

Apparently there is a variety of submini pencil tube orphans.   I was not 
able to determine the specs of the following for which I have multiple 
copies NIB.  Nothing in Sibley or elsewhere.

CK633,  CK637,  CK644 ,  CK643

By experimentation, I determined that they are dual triode tubes with 
cathodes and 6.3 V filaments.   Probably for early computers?  or missiles? 
or both.  Have thought about soldering them directly into four pin bases 
and using them as substitute 01A tubes.


At 10:10 PM 6/23/2010, Scott Johnson wrote:
>Neither of these tubes are listed in Tube Lore, so I would suspect they are
>not registered numbers.  The 5741 is listed as a HV rectifier with a UX
>Scott W7SVJ
>-----Original Message-----
>From: Boat Anchor Owners and Collectors List
>[mailto:BOATANCHORS at LISTS.TEMPE.GOV] On Behalf Of doc at kd4e.com
>Sent: Wednesday, June 23, 2010 4:53 PM
>Subject: [BOATANCHORS-TEMPE] Fwd: Subminiature Pencil Tubes?
>I am trying to chase down information about two of the subminiature pencil
>tubes I have:
>I cannot locate them online.  A Ham is interested in some
>of my subminiature tubes but I cannot ID these for purpose
>and current market value.
>Anyone have info, please?
>Thanks! & 73, doc, KD4E
>"Communicators must defend free speech
>or risk losing freedom entirely."
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