Re: Best Sec. form material

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gerry Reynolds by way of Terry Fritz <teslalist-at-qwest-dot-net>" <gerryreynolds-at-earthlink-dot-net>

Say for an 8 or 10 inch coil (that might run at a lower frequency),  how
does the losses of sonotub compare to, say, acrylic (plexiglass).

Are there meaningful differences in sealants suchas shellac, spar varnish,
polyurythene,
etc?   ...and what about overcoats on the winding or should one stick to
polyurythene.

Should the inside of the sonotub be coated (somehow) to keep moisture out?

Speaking of losses,  is a wood frame for holding copper tubing for the
primary a bad idea or would it be OK if baked and sealed with varnish.

Gerry



 > Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<dhmccauley-at-spacecatlighting-dot-com>
 >
 >
 > Sonotube is an excellent choice and works extremely well.  It sounds to me
 > that you didn't precoat your sonotube prior to winding.
 > Orange shellac is an excellent sealant for this.
 >
 > The Captain