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Re: MMC Caps

Tesla List wrote:

> Original Poster: "Robin Copini" <rcopini-at-merlin-dot-net.au>
>
> Hi Reinhard,
>
>   I have a 12 inch X 51 inch polished alu topload, (it's the one you can
> see in the second light pics), Which
>  The coil won't have anything to do with! - will continually arc up and
> down the secondary. I am having a
> third top load made which is half way between the one I'm doing now and
> the one mentioned above - I
> believe it will sufficiently load the secondary without preventing
> spontaneous breakout.
>
> I am going to decrease coupling by one inch tomorrow.
>
> In the past there hasn't seemed to be any relationship as I didn't get
> any secondary racing arcs
>
> Secondary was sanded, coated with non water based polyurethane for 3
> coats, sanded between coats,
> Then wound, coated twice a day for 10 days straight, (35+deg C for each
> day).
>
> Thanks for the compliment about the website - I am going to post more
> pics soon, including my dissection of
> my first secondary, the internal arcing left very obvious tracking
> inside the form. We live and learn!!
>
> Best Regards,
>
> Robin in OZ.
>
> > I donīt think you are at the limit of a 10" secondary with 10kVA.
> > Have you tried using a *secondary* topload in addition to your
> > main toroid? I would add an additional toroid to further load your
> > coil. If the second toroid is a polished unit, then I would add a
> > small bump to propagate streamer breakout and I would play
> > around with the coupling a bit (lower it at higher kVA levels.)
> > This should allow your secondary to get rid (i.e: longer sparks)
> > of excessive energy before racing sparks appear.
> >
> > Is there a relationship to streamer length and racing sparks?
> > I bet (okay rather guessing here) every (usually ;o)) time your
> > streamer length goes toward the 7 feet mark, you also get
> > racing sparks and you get racing sparks because of the shorter
> > arc length and not vice versa (shorter streamers because of
> > racing sparks) Am I right??
> >
> > How did you prep and coat your secondary former?
> >
> > Coiler greets from Germany,
> > Reinhard
> >
> > P.S: Great website. I still havenīt finished downloading it
> > completely......... time............
> >
> > P.P.S: Next time you take pictures, zoom in on the arcs
> > (quite) a bit more. This should give you some fascinating
> > pictures (even if they donīt look that way during true
> > operation).

Hi Robin,

What does a 12 x 51 torus cost?
Thanks for the coil specs, love your web site.

Rick Kirby