Re: Vacuum tubes

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> Original poster: "John Richardson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <jprich-at-up-dot-net>
> 
> Hi Guys,
> 
> Well, Resonance Research's Teslathon was a huge success.  Lots of awesome
> stuff, and a good time for all.
> 
> I was highly impressed by Steve Wards VTTC, and it's given me the bug to
build
> one.  I'm not all that knowledgeable with electronics, but I have a question
> that I'm hoping someone can help me with:
> 
> In an old welding shop one day, and one of the guys was holding the largest
> tube that I had ever seen.  I seem remember that he said it was out of an old
> DC welder, or maybe it was from some huge antique battery charger.  Is anyone
> familiar with one of these, and would it have any practical application in
> building a VTTC?  It seems that everyone is worried about overdriving their
> plates, and common sense would dictate that a rectifying tube of this type
> would be nearly indestructible.  Am I dreaming, or is it possible that
this has
> some relevance?
> 
> Thanks,
> 
> John Richardson

	Sounds like a big thyratron or ignitron, and useless for VTTC work.

Ed