Re: VTTC Tubes

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Trending a bit OT here, but.... tungsten filaments are easy... light bulbs
have them.
A plate is easy, a piece of copper pipe or a tin can (although, solder has a
pretty high vapor pressure, so maybe the can isn't such a hot idea)

The grid is a bit trickier, but, I suspect that a piece of window screen
would work.

Glass tubing would work fine for element supports.

Making a tube that has "some gain"  at "some frequency" probably isn't all
that tough

Making a high performance tube that you can put hundreds of watts through is
entirely a different matter.

But... for those of you wanting to have the ultimate in home-brew
VTTC's..... I just want to remind you of (I think) John Strong's comment
that amateur high vacuum systems are as frustrating and idiosyncratic as
grinding your own telescope mirrors.



----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, March 29, 2002 2:46 PM
Subject: RE: VTTC Tubes


> Original poster: "Loudner, Godfrey by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>
>
> Hi Winston
>
> I often wondered if a crude but working transmitting tube could be
> homebrewed and place inside a bell jar. It seems like one would need
> constant access to the insides to make repairs. A quickly removable bell
jar
> would be ideal. On the other hand, tube construction seems impossible for
> the homebrew artist. The specialized equipment is probably too expensive.
> Stringing and attaching tungsten filaments!---I just don't know.
>
> Godfrey Loudner
>
> > -----Original Message-----
> > From: Tesla list [SMTP:tesla-at-pupman-dot-com]
> > Sent: Friday, March 29, 2002 11:53 AM
> > To: tesla-at-pupman-dot-com
> > Subject: VTTC Tubes
> >
> > Original poster: "Marry Krutsch by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <u236-at-earthlink-dot-net>
> >
> > Hi All!
> >
> > A stupid question, but I'll ask anyway.
> >
> > Has anyone here tried to make their own high power triodes?  Since
> > real
> > transmitting triodes (833a's, etc) are very expensive, might making
> > tubes be a viable option for some?
> >
> > I was thinking of building a VTTC at some point, and if I'm going to
> > build the coil from scratch, why don't I build the tube(s) as well?  The
> > main problem would be pulling a good vacuum inside the tube without a
> > vaccum pump, but I have some ideas (Uh-Oh :-)).
> >
> > Just Wondering,
> > Winston
> >
> >
>
>
>