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
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