"David Nebenzahl"
Phil Allison

** Shame about the third and most likely scenario - one that makes the
primary R go way high.

Think " vertigris " .....

You mean *verdigris*.

So that could happen if the insulation got nicked and moisture gets in,
corroding the wire. How does that work? Narrow the wire and increase the
resistance (eventually causing an open)?


** Can happen any number of ways including at the termination points of the
enamelled wire where it is soldered to a flying lead. Solder flux is then
the trigger and moisture from the air can get to it.

The high resistance is because for some small distance, conduction is via
the verdigris.



..... Phil