[Boatanchors] When Were Metal Case Tubes First Produced?

[jeremy-ca]

The 6H6 was pictured in the May 1935 QST introduction.

While the 6AC7 may have been mentioned in March '39 its original designation 
was the 1852 which was introduced sometime late 38 and was featured in the 
January 39 RCA Review. It and the 1851, and 1853/6AB7 were all in the 39 
Worlds Fair TV sets.

Carl
KM1H


----- Original Message ----- 
From: "John Pelham" <john at radiophile.com>
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 5:51 PM
Subject: Re: [Boatanchors] When Were Metal Case Tubes First Produced?


> Metal tubes were announced by RCA in 1934, but individual types were 
> introduced starting in 1935.  To pick your two examples, 6H6 was 
> introduced in August 1935, 6AC7 in March 1939.  (Credit to the book Tube 
> Lore, by Ludwell Sibley, for the dates.)
>
> 73,
> W1JA
> John Pelham
> Web site   http://www.radiophile.com
>
> ----- 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
>
>
> _______________________________________________
>