Re: new single 833A VTTC

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

Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net> 

Running a tube with a metal plate such as the 833A I belive it is OK to run
with a cherry red/orange plate,  if it starts showing light orange/ yellow,
you are bound to do dammage.  You could try tuning it down on your variac
right below the threshold of plate redness and see if your performance is
hurt.

Regards - Jim Mitchell
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, December 24, 2003 12:45 AM
Subject: Re: new single 833A VTTC


 > Original poster: "Steven Ward" <srward16-at-hotmail-dot-com>
 >
 > Hmm, okay, this means i have more work to do... i do not wish to accept
 > needing staccato to achieve a spark length that other coils have done
 > without the staccato.  Tomorrow i will disable the staccato and work from
 > there.  Also, i know its hard to explain with words, but how red is
 > 'acceptable redness' ?  I have been letting the plate of my tube just
 > noticably get a pinkish glow to it in the center of the plate.  At 30bps
it
 > becomes much more noticable, but perhaps im over estimating the level of
 > redness.  I would like to have this coil running at 22" with no staccato
 > and perhaps 24" with staccato... that to me would be an accomplishment for
 > what ive done so far with my VTTC work ;)
 >
 > Also, do your notes mention the parameters of your setup? mainly the tank
 > cap as well as the level shifter capacitor?  Im using 2nf and 2uf
 > respectively.  Oh, and how long could you run at 22" and
 > non-staccato?  Just so i have something to go by.  Im sure i could push it
 > for about 2 seconds before full redness sets in, but i have a feeling you
 > were able to run it for awhile at that power.
 >
 > Steve
 >
 >
 > >Steve,
 > >
 > >Nice results.  I'm reading my old notes from 2/20/98.  At that time
 > >I installed a level shifted MOT onto my large VTTC while using a
 > >single 833A tube.  This arrangement gave 22" sparks without
 > >staccato, and the tube ran with acceptable redness.  The coil
 > >drew 15A  at 120 volts.
 > >
 > >Just previous to my work, Rob Stevens of Canada built a magnifier
 > >VTTC using a single 833A and level shifted MOT.  His setup also
 > >drew 15A at 120 volts, and gave the same 22" spark length.  It
 > >was not a staccato coil.
 > >
 > >Holiday Cheers,
 > >John
 >
 > _
 >
 >