Re: [TCML] VTTC Coupling

["" <dr.hankenstein@xxxxxxxxxxxxx>]

I used to run the feedback coil underneath the primary on my small 811A coils. Dr. Spark built a twin 833C coil several years ago, which Cameron later used as a reference for his coil and research, and placed his feedback coil higher up on the secondary. I duplicated Chris's coil in this respect and have found out that there is a sweet spot for the feedback coil which results in much longer sparks. Chris definitly has the knack for tuning a 833C VTTC. I would recommened his work, which can be found on his website! 

Woo


> [Original Message]
> From: Phillip Slawinski <pslawinski@xxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Date: 9/15/2008 3:53:41 PM
> Subject: Re: [TCML] VTTC Coupling
>
> Cameron can run the coil in continuous mode too.  His coil draws around 20A
> at full power.  He told me that he runs the feedback so high up so that it's
> the secondary that drives it.  At any rate he got the largest spark while
> the coil was high up on the form.
>
> On Mon, Sep 15, 2008 at 5:32 PM, <futuret@xxxxxxx> wrote:
>
> > Hi Dr. R,
> >
> > My coupling was rather low on that coil at around 0.16 or 0.18
> > I think.  I did some work at k = 0.35 but it was probably actually
> > k = 0.30 or so.  At that point a giant flashover occured and
> > destroyed the primary and seconday.  Cameron Prince uses
> > the raised grid coil.  He's applying so much peak power to the system,
> > that he can only run it in staccato I believe.  The extra high
> > voltage he's using may be changing things in some way, I don't
> > know.  I'm not really sure what's happening in his coil to
> > explain the high grid coil.  I've never heard of anyone
> > else using such a high position for the grid coil.  OT: Nice
> > stock market action lately !
> >
> > Cheers,
> > John
> > ----------
> >
> >
> > -----Original Message-----
> > From: DC Cox <resonance@xxxxxxxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Sent: Mon, 15 Sep 2008 6:04 pm
> > Subject: Re: [TCML] VTTC Coupling
> >
> >
> >
> > John:
> >
> > What coupling k value have you measured on your 833 coil?  I would guess
> > around 0.2 ???
> >
> > What is possible before destruction begins?
> >
> > I've read one person has his grid feedback coil nearly 40% up the height of
> > the sec coil.  And he's getting very good outputs.
> >
> > Dr. Resonance
> >
> >
> >
> >
> > On Mon, Sep 15, 2008 at 3:34 PM, <futuret@xxxxxxx> wrote:
> >
> >  I don't think it would work well.
> >>
> >> John
> >> -------
> >>
> >>
> >> -----Original Message-----
> >> From: Phillip Slawinski <pslawinski@xxxxxxxxx>
> >> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> >> Sent: Mon, 15 Sep 2008 3:50 pm
> >> Subject: [TCML] VTTC Coupling
> >>
> >>
> >>
> >> Is it possible to over couple a VTTC?  I have a 3.5" secondary, and I
> >>
> > have
> >
> >> a
> >> 4.5" form that I could use for  my primary.  If I used the 4.5" form
> >>
> > would
> >
> >> this be taking things a little too far?  Would there be any real
> >>
> > benefit to
> >
> >> doing this?
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