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Re: PVC secondaries



Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <DR.RESONANCE-at-next-wave-dot-net>


The problem isn't so much with the losses as it is with "tracking" across a
surface.  PVC and acrylic are somewhat hygroscopic and combines with air
water molecules forming a semiconductor down the pipe.

You need to strip with MEK or strong solvent, sand lightly, and then 3 light
coats of GE Glyptol (elec. motor rewind shops) both inside and outside the
tube prior to winding.

This forms a sealed tube and works well for TC and VDGRF work.

Best regards,

Dr. Resonance



----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, June 28, 2002 7:26 AM
Subject: PVC secondaries


> Original poster: "Mr Gregory Peters by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>
>
> Hello all,
>
> Some coil plans I have say that when using PVC as a coil form, it should
> be coated with polyurethane (or similar) BEFORE winding the wire on to
> reduce losses. Is this really necessary? I would have thought it just
> adds more loss by making the form wall thicker.
>
>
> Cheers,
>
> Greg Peters
> Department of Earth Sciences,
> University of Queensland, Australia
> Phone: 0402 841 677
> http://www.geocities-dot-com/gregjpeters
>
>
>
>
>
>