[Milsurplus] When Were Metal Case Tubes First Produced?

[John Franke]

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: [Milsurplus] 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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