RE: 18" sparks at 2KVA

["Tesla list" <tesla@xxxxxxxxxx>]

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

Hi Brett,

First of all, thanks for the compliments on my work... As for the MOT's and
their wiring, I was lucky enough to have about 30 MOT's donated to my
project last year. I've tried about every connection combination you can
think of with two of them in my VTTC. I've knocked the shuts out of some of
them also.

Hands down, the best results are using two MOT's with their outputs in
series, inputs in parallel with the shunts left in. Running this same
configuration with the shunts removed only increases current draw with
essentially the same output.

I used a skinny clip lead at first, but as you slow the pulse rate, the
sparks begin to leap off the electrode somewhat sideways. If you look
closely in the later spark photos, you'll see I have an aluminum plate about
2.5 feet long and 8 inches wide suspended from my ceiling on a rig that
allows me to adjust its height above the coil.

Cameron

> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Saturday, February 10, 2007 10:11 PM
> To: tesla@xxxxxxxxxx
> Subject: RE: 18" sparks at 2KVA
>
> Original poster: Brett Miller <brmtesla2@xxxxxxxxx>
>
> Cameron,
>
> --- Tesla list <tesla@xxxxxxxxxx> wrote:
>
>  > Original poster: "Cameron B. Prince"
>  > <cplists@xxxxxxxxxxxxxxxxx>
>  >
>  > Hi Brett,
>  >
>  > Glad to hear about the success with your VTTC. The
>  > photos and video clips
>  > are very impressive, especially for a first run.
>
> Thank you.  I did not expect to achieve those 18+
> roaring sparks on the first day the doubler was
> installed.  I have hundreds of megs of video footage
> and .jpg's.  I am lucky I didn't fry my digital
> camera.
> My main influences for this project were John Freau,
> Steve Ward, and yourself, and it looks like I am
> pretty close, if not equal to what Steve was getting
> at this point in his project.  Oh, and I am planning
> on purchasing an 833C he has for sale.
>
>  > If you like the non-staccato mode, I would recommend
>  > the 833C. It can
>  > basically run non-staccato in a VTTC all day long
>  > and not even show a hint
>  > of plate glow. I recently picked up one on eBay and
>  > began playing with it.
>  > It's significantly more robust than the 833A.
>
> Well, I should say I have never ran staccato, so I
> really don't know if I would like it better or not.  I
> have only seen it on little compressed medium quality
> web videos, which don't do any high voltage footage
> justice.  I *need* staccato to run more sensitive
> tubes at a lower pulse rate...I will probably change
> my mind once I've actually used it.
>
>  > I finally got my staccato board repaired earlier
>  > this week. That and the
>  > replacement MOT's (one of mine was toasted due to
>  > primary shorting to
>  > chassis) have my v8 coil back up and running. I hope
>  > to get everything tuned
>  > back in and start seeing those 3' arcs again soon.
>
> The ones you have coaxed to reach up for that skinny
> clip lead wire are surely some of the most amazing
> vttc arcs I have ever seen captured on "film".
>
>  > I also borrowed a 7,200V PT from David Rieben with
>  > plans to build another,
>  > larger VTTC. I hope to try to compare a VTTC driven
>  > by a doubler with a
>  > non-doubled supply.
>
> I thought of that too.  Two big MOTs in series vs a
> comparable sized MOT with doubler installed.  Some
> pictures on your site suggested you tried that
> already...I thought I saw a pic where you had two MOTs
> in series?
>
>  > I also want to see what an 833A
>  > will really take
>  > voltage-wise in a VTTC as I may try a doubler on the
>  > PT as well.
>
> That should be informative and entertaning.
>
>  >
>  > Keep us posted on your progress.
>  >
>  > Thanks,
>  > Cameron
>
> I will, and by the way, I am happy I went with your
> idea of an extra long primary/feedback former....Some
> configurations are much happier with the feedback coil
> slid all the way up to the top.  I have found two
> sweet spots on that, but one draws about 5 amps less
> from the wall, so I tend to use it.
>
> Later!
>
> -Brett
>
>
>
> __________________________________________________________________________
> __________
> Any questions? Get answers on any topic at www.Answers.yahoo.com.  Try it
> now.