[Ron Ramirez]

I blamed it on the translucent nitrocellulose insulator that Philco used between primary and secondary of the windings. The breakdown of this, combined with the acids in the wax Philco used to seal the coils, was a recipe for disaster (eventually).

I use plastic electrical tape these days to replace the insulator, and hi-temp hot glue to hold the ends of the wires in place on the tape.