[Boatanchors] When Were Metal Case Tubes First Produced?

[J Forster]

Thanks very much. That's a few years earlier than I thought.
-John

==============

John Franke wrote:

> On April 1, 1935, GE and RCA unveiled their revolutionary all-metal
> receiving tube at the IRE show in New York City.  By the end of June, 25
> companies had joined the bandwagon.  The initial release was nine tube
> types: 5Z4, 6A8, 6C5, 6F5, 6F6, 6J7, 6K7, 6L7, and 6H6.
> This is from "History and Development of the All-Metal Radio Tube," Bro.
> Patrick Dowd, W2GK, AWA, Vol. 16, No. 4, March 1976, and Vol. 17, No. 1,
> June 1976.
>
> John  WA4WDL

==============

> ----- Original Message -----
> From: "J Forster" <jfor at quik.com>
> To: "Milsurplus" <milsurplus at mailman.qth.net>
> Cc: "BOATANCHORS" <boatanchors at mailman.qth.net>;
> <BOATANCHORS at LISTSERV.TEMPE.GOV>
> Sent: Friday, May 23, 2008 5:39 PM
> Subject: [Boatanchors] When Were Metal Case Tubes First Produced?
>
> > Does anyone know when the metal cases tubes (6H6, 6AC7,...) were first
> > introduced?  Was it before WW II?
> >
> > Best,
> > -John

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