[Milsurplus] Metal tubes

[Al Klase]

Thanks, Mike.

I had assumed this was common knowledge among radio people, but I guess 
only us geezers remember.

I've just posted another drawing from the 1940 RCA Receiving tube 
manual:  http://www.skywaves.ar88.net/Metal_Tube.png

These illustrations were true works of art.  The original RCA/GE metal 
tubes had individual glass seals around each lead, as shown in the 
patent drawing.  The 1940 drawing shows the later design where the leads 
are all molded into a glass button that also incorporated the exhaust tube.

Regards,
Al

On 2/18/2010 10:52 AM, Mike Morrow wrote:
> jcoward5452 at aol.com wrote:
>
>    
>> As you all know,inside that metal tube is a glass tube.
>>      
>
> Al wrote:
>
>    
>> Actually, that's not the case...The only glass is in the seals
>> where the wires exit the tube.
>>      
> I posted yesterday the link to GE's patent description for
> metal tubes:
>
>    
>> GE's interesting patent for metal vacuum tube technology is
>> available at: http://www.freepatentsonline.com/2124428.pdf
>>
>> Patent application was made in September 1934, and granted
>> in July 1938.
>>      
> The details of tube construction are described, and one point
> made is that, other than use a spacer and wire-lead seal, glass
> is NOT used in construction.  It's almost all metal.
>
> Mike / KK5F
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/