Re: Idea for big VTTC

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

Original poster: "Metlicka Marc by way of Terry Fritz <twftesla-at-uswest-dot-net>" <mystuffs-at-orwell-dot-net>

here's a wild idea (don't laugh to hard) break the tip off of a tv
picture tube, cut off the neck at the diameter needed to slide your
"home brew" plate-grid-??? base into. build it onto a thick ceramic
base, poor epoxy into the tube and put your base in place, stand upright
so the epoxy fills and seals around the base. then use another tv
picture tube to suck the air out of the vacuum in your BIG tube, wahlah
a home built, much time invested into, huge triode. crazy idea?
i know what your thinking, but it looks good in my head.
marc m.

Tesla list wrote:
> 
> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<cwillis-at-guilford.edu>
> 
> Hi Drew,
> 
> I would be very interested in a large-scale tube coil effort.  It's quite
> likely that some surprises and interesting effects are to be found in  >10 kW
> CW and pulsed tube coil systems, which to my knowledge have not ever been
> built.  If someone has a lot of spare dough to blow...this would be a most
> worthwhile project.  It's one of my goals in life to make a 100 kW Staccato
> tube coil :>)
> 
> About building your own tubes- I think the technical and economic demands
keep
> most of us from being able to make a good tube.  You need a plethora of
> refractory metals and ceramics, vacuum pumping equipment, etc.  But that
> shouldn't deter you from building your own tube, even if it cannot handle
power
> and has lousy performance.  I think it's a super idea that will give
anyone an
> opportunity to learn about not only tubes, but also high vacuum
technique, for
> example.  And with the bell jar and vacuum pump you suggested, I don't think
> you'd have too hard a time getting a triode that actually worked.  (Here's an
> interesting tidbit I found in looking through "Demonstration Experiments in
> Physics" (Sutton, 1938):  apparently you can build a "fresh air triode",
i. e.
> 1 atm.,  complete with oxide-coated filament, that allows you to make a
> "qualitative determination of several important characteristics of
> three-electrode tubes, such as dependence of plate current upon electrode
> separations, potentials, filament temperature"....etc.) I'm betting if
you make
> a simple triode in a medium-vacuum bell jar, even with an aluminum foil
plate,
> window-screen grid, and lightbulb filaments, you could make a small RF
> oscillator with it...  probably not a tesla coil though!
> 
> -Carl
> 
> 
> 
> "Tesla list" <tesla-at-pupman-dot-com>
> 03/19/2001 05:22 PM MST
> 
> To: tesla-at-pupman-dot-com
> cc:
> bcc:
> Subject: Idea for big VTTC
> 
> Original poster: "Drew Murray by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <drewallmighty-at-hotmail-dot-com>
> 
> I was thinking about how one could build a really big VTTC or SSTC while i
> was walking home from school today. the idea of building really large
> semiconductors or big vacume tubes came upon me. Is it possible that if one
> had a vacume pump and a vacume jar, could they construct a really big vacume
> tube for operation with a really big tesla coil. It would be interesting to
> see the odd sparks produced by VTTC on a larger scale. Just an idea! Lemme
> kow what you think.
>                                                      Curious,
>                                                      Drew Murray
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