Well, that is the wire that is generally used in an OPT, precisely because it is solderable. I have some Edcor GXSE output transformers bought when they were still using open frame construction rather than the more recent version with end bells, and solderable wire is clearly used in the transformer construction and terminated to exposed lugs for the primary, ultralinear tap, and the secondary connections.
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Solderability is a big advantage in production, no wonder they choosed solderable for it, especially since the dk of wire enamel is not given by the manufacturers of the wire and they would have to go through the trouble of finding it out by themselves. Why would they?
Anyway, transformer manufacture is about compromises, impregnate the coil with what is avaiable today and the dk is equally high.
The old days are gone where low dk waxes where avaiable...
Anyway, transformer manufacture is about compromises, impregnate the coil with what is avaiable today and the dk is equally high.
The old days are gone where low dk waxes where avaiable...
@Keit: Did you ever get some believable answers to enamel coating thickness? I'm wondering about thickness when you start reducing wire diameter in order to pack more turns ons and whether it causes copper resistance to rise sharply. By the way, digital micrometers having increments of 1um are available, and my Sylvac even came with a calibration chart.