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Re: [TCML] 6"secondary

Just an open musing spurred by this conversation...

No one asked what he was winding the larger form with. He could use thicker
wire, or space wind the same gauge as the 4". In either case, it would be
reasonably easy to match the resonant frequency of the old, smaller
secondary/topload combo.

So if he matched the resonant frequency of the small coil with larger C and
smaller L in the new large coil (and retuned and kept k constant...), how
would this influence spark length and behavior? My gut feel is brighter,
snappier sparks with maybe the same overall spark length.

I wonder if anybody has tried this.

Food for thought,
- Jason

On Tue, Dec 16, 2014 at 11:53 AM, John Cooper <wt5y@xxxxxxxxx> wrote:
> It was originally 50ft tubing and I've added another 10ft.  I really need
> to redo it by using a 60ft (longest they sale that I've ever seen sold).
> And then I can add to that.  If its going to be more than say 80ft of
> tubing needed, then a major redesign is in order.  I was only considering
> it if it can be used with my current coil without major redsign ie redoing
> the coil supports hold that much tubing.
> Sent from my Cricket smartphone
> -------- Original message --------
> From: Phil <pip@xxxxxxxxxxx>
> Date: 12/16/2014  02:28  (GMT-06:00)
> To: 'Tesla Coil Mailing List' <tesla@xxxxxxxxxx>
> Subject: Re: [TCML] 6"secondary
> John,
> My earlier reply 'assumes' you have sufficient spare turns on the primary
> to
> play with, otherwise as Gary points out you'll need to add some outer
> turns.
> Either way, watch the coupling.
> Phil
> -----Original Message-----
> From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Phil
> Sent: 15 December 2014 21:01
> To: 'Tesla Coil Mailing List'
> Subject: Re: [TCML] 6"secondary
> You need to be careful with the 'k' or coupling factor. A larger secondary
> will be nearer the inner turn of the primary and you may end up over
> coupled
> causing racing sparks. Also the reduced clearance to the inner turn may
> cause flashover, personally I would remove the inner turn ( one whole turn)
> - it will have little effect on the primary inductance.
> Use Javatc as a guide to get the right coupling or 'k' factor.
> The 0.25 inch tube will be ok as there's no need to change that unless you
> increase power significantly.
> Regards
> Phil Tuck
> www.hvtesla.com
> -----Original Message-----
> From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of John Cooper
> Sent: 15 December 2014 02:38
> To: tesla@xxxxxxxxxx; alan@xxxxxxxxxxxxxx
> Subject: [TCML] 6"secondary
> If I just swap my 4" x22" secondary with a 6" x34"secondary and bigger
> toroid 6" dryer duct vs 4" are any other changes needed other than retuning
> the primary?  For instance instead of 1/4 tubing primary would the diameter
> have to be increased?  I wouldnt be changing anything on the primary side.
> It would just run weaker until I increased the nst current and mmc array
> right?
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