[Milsurplus] Metal tubes

[Mike Morrow]

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