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Hello,
Please bear in mind that old transformers usually did not use stranded wire as lead exit on their LV windings, but a lenght of tubing over the enamelled copper wire (at least, this is how old transformers in Italy were done) was the usual arrangement. What usually is the problem is the enamel is not scraped very well to take solder and to make a decent joint. Please, before condemmning the old PT, try to scrape the ends of the 80's filament winding to bare and shining copper, then retest.
I would be really surprised if this winding gave up the ghosts, as it employs few turns of a relatively heavy gauge magnet wire
Cheers
Giulio Maiocco
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