Re: [TCML] How to Fix Damaged Secondary

["Harold Weiss" <hweiss@xxxxxxxxxx>]

Hi Amir,

What kind of varnish did you use?

With my older coils, I used polyurathane, coating every 3 hours till the 
coil was smooth.  The inner coats stayed somewhat liquid for years.  Having 
a breakdown, the coil would ooze a bit, and recover the damage, with very 
few problems afterwards.  As long as the wires aren't melted together, a 
little clean up, and recoating  may be all you need.

Worse case, you may have to cut a few turns out and splice.

You may want to also reduce coupling.

David Weiss



When testing at about 5 Kw, I noticed some arcing one individual turn at 
exactly one point about 12" on the secondary. Upon examination, there is a 
small burn mark at the point on the turn where it was arcing. At this point 
on the wire, the varnish is melted and has left the point exposed. I have 
re-varnished the entire coil already. Is there anything I can do to "heal" 
the damaged point to prevent further arcing? I was originally planning to 
step up the power to about 12 Kw, but I might have to hold off, or possibly 
reduce coupling. Any suggestions or advice would be much appreciated.


Thank you for your kindness,


Amir Mojarradi
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