[Boatanchors] When Were Metal Case Tubes First Produced?

[jeremy-ca]

Also announced was the 6D5 power triode which died a fast death.

QST had a release in the May 1935 issue with detailed specs in subsequent 
issues.

GE said the first radios to use the new tubes would be their fall 1935 
models.

Hallicrafters had them in the SX-9 which was introduced in November 1935 but 
had production delays well into mid-late 36.

Carl
KM1H



----- Original Message ----- 
From: "John Franke" <jmfranke at cox.net>
To: "J Forster" <jfor at quik.com>; "Milsurplus" <milsurplus at mailman.qth.net>
Cc: "BOATANCHORS" <boatanchors at mailman.qth.net>; 
<BOATANCHORS at LISTSERV.TEMPE.GOV>
Sent: Friday, May 23, 2008 5:45 PM
Subject: Re: [Boatanchors] When Were Metal Case Tubes First Produced?


> 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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