Understand - there is nothing sacred about the 1000-1500 turns number or
the 5:1 aspect ratio. They're just guidelines. But I would definitely use
a 6" minimum diameter secondary, and using #26 AWG, a 28" winding length
gives a 4.5:1 ratio and ~1600 turns. I was fortunate to have found an
abandoned scrap of 6" PVC at a construction site. Failing that, try seeing
if any plumbing supply places have damaged pieces. I wouldn't recommend
settling for 22" winding length - you want every inch you can muster
between the primary and the top load.
Regards, Gary Lau
MA, USA
On Sun, Feb 22, 2015 at 5:27 PM, Dave Halliday <dh@xxxxxxxxxxxxxx> wrote:
> If your neighborhood is large enough to support both a Lowe's and HD, it
> should be large enough to have a commercial plumbing company.
>
> Go to them and see if they could sell you a length of 8" PVC tube. Explain
> what you are doing and if they are interested enough, they might give it to
> you.
>
> Be prepared to pay though - Grainger's has a 10' length of 8" schedule 40
> (thin wall) for $138.60
>
> http://www.grainger.com/product/HARVEL-Pipe-22FR49?functionCode=P2IDP2PCP
>
>
> > -----Original Message-----
> > From: Tesla [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Tim Gilmore
> > Sent: Sunday, February 22, 2015 11:45
> > To: Futuret; Tesla Coil Mailing List
> > Subject: Re: [TCML] Dual identical FRANCE neon sign
> > transformers (15000v60mA each) in parallel
> >
> > I went to Lowes and found a greenish 6" pvc? Tube BUT it's
> > only 24" and the only 6" pipe they carry. Also went to Home
> > Depot and bought a 4" standard pvc whitish tube but only 24".
> > They do carry longer 4" pipe but it would need to be cut from
> > a 5' length.
> >
> > Since I'm using 2 15000v 60mA NST I'm thinking I will need to
> > use the 6" pipe but for 1200 turns Ill need 26 gauge for 22"
> > but leaves me with a 3.5:1 ratio. Is this good enough not
> > being at 4:1 or 5:1 ratios - or is it better to just use the
> > more common 4" pipe (2' or buy a taller one) with the 2 NSTs?
> >
> > Thanks, Tim
> >
> > > On Feb 21, 2015, at 3:22 PM, Futuret via Tesla
> > <tesla@xxxxxxxxxx> wrote:
> > >
> > >
> > > Tim,
> > >
> > > The secondary does not need to be as tall as the spark is
> > long. For example
> > > my TT-42 coil has an 18" tall secondary and gives 42"
> > sparks. However sparks
> > > are more likely to arc down from the toroid and strike the
> > primary if the secondary
> > > is too short. I often place a smaller toroid below the
> > main toroid to raise up
> > > the main toroid some to keep sparks away from the primary.
> > The length
> > > of the sparks has a lot to do with the current in the arc
> > and the growth
> > > of sparks over successive gap firings. It seems to me that
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla