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I always figured the wax, rubber, or plastic coating was more of a dampening or physical barrier. Surely the wire windings were originally vacuum impregnated with varnish like any other modern transformer? BTW the melted wax will naturally impregnate the windings without a vacuum chamber. Not sure I remember the process, possibly convection from the cooling process.
Last edited by Kevin Kuehn; 11-19-2011 at 12:41 PM.
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