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Re: the back of secondary winding



Original poster: "Scott Hanson" <huil888@xxxxxxxxxxxx>

Aaron wrote:

" I was watching a friend's coil this weekend, and his secondary suffered an interesting yet unfortunate fate: All of a sudden, a bright spot of light appeared on the side of the secondary. After turning off the coil and approaching, it was observed that a nice little hole had burned in the winding. It did not appear to have resulted from a strike or racing sparks or anything quite so obvious."

"His secondary was coated with fiberglass."

When you state that his secondary was coated with "fiberglass", what exactly do you mean? Fiberglass cloth or matt, impregnated with polyester or epoxy resin? Or just coated with resin, without any fiberglass? If it was truly covered with fiberglass, was it woven fiberglass cloth, or random-fiber matt?
If glass was actually used, can you find out how many layers were applied?
Also, can you find out what type of wire was used to wind the secondary? Conventional enameled magnet wire, or something else?
Close-wound, or space-wound?

Always interested in the conditions leading to a failure, and the results of the subsequent failure analysis......

Regards,
Scott Hanson