Re: dual 833A VTTC, problems

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

Original poster: "Dr.Resonance by way of Terry Fritz <teslalist-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>


Are you running equalizing parasitic RF chokes on the plates?

Also, you might check with Ed Wingate as he has an excellent dual 833
circuit.

Regards,

Dr. Resonance



----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, January 14, 2003 5:52 PM
Subject: dual 833A VTTC, problems


 > Original poster: "Steven Ward by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<srward16-at-hotmail-dot-com>
 >
 > Hi all,
 >
 > I have been working on my dual 833A VTTC project for a while now.  I just
 > recently fired it up again (after blowing the power the first time a month
 > ago or so) and keep happening upon the same problem.  The tubes are not
 > matched, so one gets more red than the other.  Rather, one tube is red,
the
 > other dark (no redness).  I found that i originally had way too much grid
 > feedback, so i cut it down quite a bit.  This made the sparks grow from
 > about 10" to about 20".  But even 20" is pathetic for 2 of these tubes :(.
 > Basically what is limiting me is that one tube is getting red, and the
 > other not, so i cant just let all of the stress fall on one tube.  So i
 > have 2 ideas that i propose (I think John Freau actually may have told me
 > these i ideas, i cant remember).  1, perhaps put a resistor in series from
 > the red tube grid to the grid winding.  This would reduce the turn on
pulse
 > from the grid coil, going into that tube.  2, make a grid coil tap, and
tap
 > the red tube at a lesser turn until i get them to go red at ~ the same
 > time.  This could be tricky, well actually, either way is tricky!
 >
 > So has anyone ever had this problem?  If so what was the solution?  Also,
 > can anyone think of any other solutions?  And which of my proposed
 > solutions looks better?
 >
 > Also, a problem that i thought i would not ever have to worry about.  Well
 > several small problems.  The parts are getting warm.  The primary coil
gets
 > warm after about 30 sec, the 36A RMS doorknob cap array gets slightly
warm!
 > the secondary base gets rather hot, and the discharge point may need to be
 > replaced often, if i dont get tungsten :)  These arcs are white, hot, and
 > thick!  So really this coil is becoming a in depth project, when it comes
 > to all of the de-bugging(not nearly as bad as the other tube coils!). And
 > of course, there is always the possibility of catastrophic faliure when
 > running about 2+ KW in a 12"x18" area!
 >
 > Steve Ward.
 >
 >
 >