Re: First light with 833 tube coil, then silence

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>

Gerry,

Yes, actually that was a simplified diagram. I do indeed
rectify and filter the output of my 2 "piggybacked" MOTs
for about 4000 VAC through 5 paralleled  2200 VAC, .9 uFD
MOT caps and a large HV "hockey puck" style diode from
a large x-ray transformer. Since the hockey puck diodes
were originally stacked as sets of 4 for a 150 kV rating,
I'm assuming each one of the pucks to be good for about
37.5 kV PIV. Don't think I will be overtaxing their volt-
age capabilities ;^)

David

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, September 23, 2006 11:44 PM
Subject: Re: First light with 833 tube coil, then silence


> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
> Hi David,
>
> I might be missing something, but the schematic looks like the
> secondary of T1 is connected to the plate thru the primary of the
> TC.  It seems like half of the time, the plate voltage will be
> negative and I dont see how that would work.  Doesnt the T1 secondary
> need to be rectified and filtered first??
>
> Gerry R
>
>
> >Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
> >
> >Hi all,
> >
> >Finally got the VTTC all wired together and tried out
> >first light tonight. Was having trouble with the stacato
> >driver as I couldn't get too much of anything out with
> >the stacatto driver energized. I did start getting about
> >8" continous "swords " with the variac turned up to
> >about 120 volts and drawing 20 amps (w/out stacatto).
> >Didn't seem too efficient but this is my first time with
> >a VTTC, ever. It's basically patterned after Steve Ward's
> >22" 833A VTTC:
>
><http://www.stevehv.4hv.org/VTTCfaq.htm>http://www.stevehv.4hv.org/VTTCfaq.
htm
> >the third picture down. At least it did work some until
> >I started trying to vary the resistance in the grid leak
> >bypass resistor (R1). Now all of the sudden it won't
> >put out anything, nada, zilch! I tested that resistor,
> >the capacitor C2, and even tried swapping out 833A
> >tubes, all to no avail. Every component checked out
> >good and changing out the tube with spares didn't
> >solve the problem either. Can any of you vauum tube
> >gurus help me out here? :^))
> >
> >Thanks,
> >David
> >
> >
>
>
>