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Re: Idea for big VTTC
Original poster: "David Trimmell by way of Terry Fritz <twftesla-at-uswest-dot-net>" <davidt-at-pond-dot-net>
The lead in the glass may pose a issue. Follow this link for some
"historic" info: http://antiqueradios-dot-com/features/vacuum.shtml
Regards,
David Trimmell
On Mon, 19 Mar 2001, Tesla list wrote:
> 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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