Very much On Topic: Integrated Vacuum Tubes

[William Donzelli]

> > Sylvania also made some subsubminis - tubes in T1 bulbs, but they never
> > sold either. A T1 bulb is 1.8 inch in diameter.

(correction to my post) Make that 1/8 inch.

> There were some very small wire ended ones made for proximity fuzes in
> anti-aircraft shells.  They are about the size of one of those small 
> neons.  Someone in the USA has a stock of new ones and I wouldn't mind 
> getting a few to play with, but I've lost his address.

I have some of those as well. Etco (remember them?) used to sell them for
10 cents each. I miss Etco.
 
> There were also some vacuum tube ics being produced experimentally a
> few years ago with a few hundred planar devices in one package.

Every five years someone rediscovers this. 

William Donzelli
aw288 at osfn.org