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RE: your 833 coil

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

Wow, 3kV @ 1.2A... That must be a beast... I started out trying both a
Thordarson and a Stancor plate transformer for my coil. They were rated
3,750VAC @ 500mA. Powering the coil for them was a breeze as they didn't
even get warm. I had a difficult time getting them to peak out with my coil
because they pulled so much current. They would easily pop the 20A breaker
in my garage. When I switched to the MOT's, I was able to get better output
without as much current draw.

I did mean 125 kV on the diode, but I made a mistake in the current
capability. It is a 1.5A diode from an x-ray transformer.

Here is a picture of the coil with the Stancor transformer:


You can see the diode just to the left of it. It's the large black hockey
puck. The MOT's are installed in place of the Stancor now and in addition to
the lower current draw and better output, they weigh significantly less.

I am sure the plate transformers would have been fine had I not had the
requirement to run on a standard 120V 20A circuit as will your 3kV

As for the Teslathon, I certainly appreciate the invitation and I wish I
could make it. I will be returning from Europe that day after visiting the
Tesla museum and Tesla's home.


> -----Original Message-----
> From: resonance [mailto:resonance@xxxxxxxxxxxx]
> Sent: Saturday, August 12, 2006 12:09 PM
> To: Cameron B. Prince
> Subject: Re: your 833 coil
> i don't have a vac. tube coil at present, but I happen to have a 3,000
> Volt,
> 1.2 Amp transformer, so I was planning on doing a dual 833C coil.  Thanks
> for the tip on the grid coil
> That was supposed to be 12.5 kV I suspect and not 125 kV --- right?
> If you are coming to our Teslathon next month, please bring your coil
> along.
> If flying you can ship it and we can provide a HV power supply for you.
> Regards,
> Dr. Resonance
> >
> > The MOT's have paralleled primaries and the secondaries are in series as
> > you
> > stated. I am using Dave Sharpe's level shifting design with a single
> 125kV
> > .5A diode and four 1uF MOT caps in parallel. So the voltage on the tube
> is
> > half wave rectified DC. I am using Steve Ward's circuit for the staccato
> > controller presently, but I am also going to build Dan McCauley's
> version
> > and try it.
> >
> > Let me know if you try raising your grid coil and what results you
> obtain.
> >
> > Thanks,
> > Cameron
> >
> >> -----Original Message-----
> >> From: D.C. Cox [mailto:resonance@xxxxxxxxxxxx]
> >> Sent: Friday, August 11, 2006 11:02 PM
> >> To: cplists@xxxxxxxxxx
> >> Subject: your 833 coil
> >>
> >>
> >>
> >> The MOTs are primarys paralled with secondarys in series --- right?
> >>
> >> are you running any type of voltage doubler or just using the 4 kV?
> >>
> >> Rectified or running straight AC on the 833?
> >>
> >> Using the statacco type controller on the grid or just grid feedback,
> ie,
> >> running continuous mode at 60 Hz?
> >>
> >> Dr. Resonance
> >
> >