[Milsurplus] Re: [Boatanchors] When Were Metal Case Tubes

[Roger Basford]

----- Original Message ----- > ------------------------------
>
> Message: 4
> Date: Fri, 23 May 2008 17:39:46 -0400
> From: J Forster <jfor at quik.com>
> Subject: [Milsurplus] When Were Metal Case Tubes First Produced?
> To: Milsurplus <milsurplus at mailman.qth.net>
> Cc: BOATANCHORS <boatanchors at mailman.qth.net>,
> BOATANCHORS at LISTSERV.TEMPE.GOV
> Message-ID: <483739A2.36C391E4 at quik.com>
> Content-Type: text/plain; charset=us-ascii
>
> Does anyone know when the metal cases tubes (6H6, 6AC7,...) were first
> introduced?  Was it before WW II?
>
> Best,
> -John

Not strictly what you're looking for I would guess, John, but the Catkin 
tube/valve pre-dates the 6H6, etc by a few years, 1932.

see http://www.tubecollector.org/documents/catkin.htm

73

Roger/G3VKM




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