Oddball Vacuum Tube?

Why not a fluorescent lamp. It has 4 glass/metal seals. Just cut it open, clean out all the powder and reuse the coil clamps.

It helps if you have a glass lathe, but it can be done without one.

L Al,

What was it used for?

Jon

It was made as a diode for AM radio reception, but the article also mentioned that it could be made as a triode.

The article was in a issue of Radio-Electronice from back in the 70's, bloke made his own vacuum tube for a laugh, I thought the tube was a Evers or Evens tube, but when you get to be a old fart of 51, ya start to forget things!

Al

Got about 3 yrs "head-start" on you ... (fergettin' things).

Haven't seen in any posts as yet a link to this video...<link

Not allowed to "stream it" here at work for a preview, but looks like it might provide you some insight. [I haven't seen a response to *what* you wish to do with said item...(?) I, too, am curious]

Had an uncle who, for as long as I knew him ('bout 40 years) was a ham-bug. As for myself, I never could get comfortable with Morse-coding.... Regards~~~

I've seen that video before & the comment on the web site is correct, once you start watching you won't stop. A true craftsman at work.

It's not as much doing anything with the tubes, as much as decribing them to a friend here.

Odd you should mention the Morse code requirement--that was dropped a few years ago.

Al

This tube was the first ac operated indirect heated thoriated cathode invented by Ted Rogers.

Prior to this, you had direct emission and ac heating made audio hum.

More where this came from:

https://www.ieee.ca/millennium/alternating_current/ac_recollections.html

FIY many vacuum tubes, especially those that operate at high voltage, have contacts at both ends of the tube. Some examples include rectifiers, thyratrons, and ignitrons.

L Al,

Something like this?

Jon

Lock Al,

Now--someone help me with the name of the tube, all I can remember is that was designed by a Canadian.

Name of the the tube?

Did anyone mention rectifier? The articles mention replacing batteries with it to get dc.

The skinny tubes were called pencil tubes.

Jon

If you want thick walled glass, use a compact fluorescent lamp tube.

You might be thinking of something based on the old RC triode made in Montreal by EB Myers around 1920. It looked something like a cartridge fuse with a red cap on one end and a black one on the other. Myers worked for de Forest off and on and sort of borrowed the design. de Forest got an injunction to make him stop making the tubes, so the old Myers tube had a prominent "Made in Canada" stamp in hopes of preventing more lawsuits. I don't know if that worked - I think Myers went bankrupt.

Yep--THAT'S the tube I was thinking of!

Thanks!

Al

If you want, I should be able to get you a picture next week.

Has anyone here ever heard of a thyratron?

Post 5 beat ya to it .... or , were you needing some "Google" links to information about them...?

E2V make them

So does Perkin Elmer. - 35,000 Volts, 1,000 Amps, switched in about 2 nsec.