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Re: Sonotube HV properties (fwd)



---------- Forwarded message ----------
Date: Wed, 26 Feb 1997 16:05:07 -0500
From: "Edward J. Wingate" <ewing7-at-frontiernet-dot-net>
To: Tesla List <mod1-at-poodle.pupman-dot-com>
Subject: Re: Sonotube HV properties (fwd)

Tesla List wrote:
> 
> ---------- Forwarded message ----------
> Date: Wed, 19 Feb 1997 22:18:38 -0700
> From: Tesla List <tesla-at-pupman-dot-com>
> To: testla-at-pupman-dot-com
> Subject: Sonotube HV properties
> 
> Subscriber: lod-at-pacbell-dot-net Wed Feb 19 22:05:48 1997
> Date: Tue, 18 Feb 1997 22:22:28 -0800
> From: lod-at-pacbell-dot-net
> To: tesla-at-pupman-dot-com
> Subject: Sonotube HV properties
> 
> Ed Wingate wrote:
> 
> > Bert,
> >
> > Although I agree with Richard that cardboard is definitely not the ideal
> > material to seek for secondary forms, I used 20" Sonotubes for the
> > secondary forms on my half wave twin coil and have not had any voltage
> > breakdowns in over three years of operation. The only coating used on
> > the windings is two or three light coats of shellac to hold the wire in
> > place, not for insulating purposes.
> 
> Hi Ed,
> 
> A lot of people have told me that Sonotubes are patently unsuitable for HV work,
> that they absorb moisture, the ink conducts, etc.
> 
> But your half-wave coil success clearly shows that these tubes can be used for
> high-performance TC applications.  Could you tell us the brand of paper tube
> that you used to make your coils?
> 
> -GL

Greg,

The sonotube I used for my twin was obtained from Keystone Builders
Supply in Rochester, N.Y. and is made by Sonoco Products in Canadaigua,
N. Y. I believe Sonoco Products has other plants around the country.
Keystone has other outlets around New York state, but I don't know if
they have other places around the country. Most large commercial
builders' supply companies should have similar products. Just be certain
that the tubes are stored indoors in dry conditions and have not been
exposed to rain or snow. As I said before, these aren't the ideal
coilforms, but when you get up into the 18" to 36" diameter coils, more
ideal materials aren't as easy to find to find or as reasonably priced.

Ed