RE: First light with 833 tube coil, then silence

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Cameron B. Prince" <cplists@xxxxxxxxxx>

Hi John,

He's using a level shifter with the single diode and a triac to pulse the
tube. His circuit is exactly like Steve Ward's other than he's using the
raised grid coil like my VTTC.

Cameron

> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Sunday, September 24, 2006 11:15 AM
> To: tesla@xxxxxxxxxx
> Subject: Re: First light with 833 tube coil, then silence
>
> Original poster: FutureT@xxxxxxx
>
> In a message dated 9/24/06 10:38:30 AM Eastern Daylight Time,
> tesla@xxxxxxxxxx writes:
>
> >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
>
>
> David,
>
> Since you're rectifying and filtering the MOT output, it seems
> to me that you have a 4000 VDC power supply not AC.
> A DC vttc tends to draw a lot of power but produces
> quiet, short, torch-like sparks without staccato.
> Am I missing something?  Are you maybe using a level-
> shifted AC power supply?  In any case if you are using a
> DC HV supply, then a typical staccato controller which
> uses an SCR to lift the filament from ground won't work.
> A high powered transistor instead of the SCR would be
> needed.  I realize you're not using the staccato right now.
>
> John