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It is my opinion that copper wire corrosion in the HV cage is not uncommon. I had this problem on my Hallicrafter 820 set. I think this is exacerbated inside the HV cage due to corona that can cause ozone, which is highly corrosive. A small knick in the varnish covering the wire can expose bare copper which will oxidize over time and physically weaken the wire.
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After repair.
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Nice, but I would j hook the copper wire to make the connection long term stable. In your case it could be better not to touch the connection any more to avoid further damage. I usually clean flybacks (from our european b&w sets) with WD40 to protect them from moisture and soften dried out isolations. Take care if there are carbon track pots and don't use WD40 in this case.
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Wet WD40 isnt that easy to light either. Many years ago I was trying to fix a 30s fan that I eventually found had a bad contact brush and it was arcing like crazy but not easy to keep enough WD40 on the rotor to sustain burn for more than a couple seconds.
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