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Old 13th Aug 2017, 7:51 am   #9
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 9,041
Default Re: Toroidal choke failure

To the list of important parameters, I'd add self-resonances. Having one hit the switching frequency can be dramatic.

Dropping a gauge and going to 'Heavy Formvar' enamel may be the best move. It's possible that the original was made with light solder-through vanishing varnish coated wire.

David
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