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Sonotube HV properties
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To: tesla@pupman.com
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Subject: Sonotube HV properties
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From: lod@pacbell.net
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Date: Tue, 18 Feb 1997 22:22:28 -0800
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Subscriber: lod@pacbell.net Wed Feb 19 21:20:25 1997
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