Re: Secondary is throwing small streamers off the top two wraps - help?
On NST powered coils usually the toroid is approx 1 inch above it. 8 inches
is definitely too high. If you take some time exposure photos with a
camera, ie, 4 sec f2, with black & white film, then look at the photos. The
corona is detectable with film should be radiating horizontal or below. It
above the horizontal then your toroid is too high and is not providing
enough electrostatic shielding.
It is also desireable to spacewind the last 4-5 turns with some fishing line
and then remove the line and disgard after sealing the wire to the coil.
This slowly reduces the capacitance value on the last few turns and helps to
prevent sudden HV buildups on the last turn.
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Friday, February 25, 2000 9:21 PM
Subject: Secondary is throwing small streamers off the top two wraps - help?
>Original Poster: "William Parn" <parn-at-fgm-dot-com>
>Uh oh the top two windings of my secondary started spraying 4" arcs
>out off it all around.
>Do you have any idea why that might be occuring?
>John mentioned that my toroid might be to high off of the secondary.
>It is about 8" above it.
>Any other thoughts would be very appreciated?