"David Nebenzahl = Idiot "


Wouldn't it be possible to have an original 4000ohm shorted to 900ohm
too?

** No.

The ratio between rated primary Z and winding resistance is never less
than 5:1 and is typically 10:1 or more.

You may have a point there.

OK, let's climb down into N. Cook's pit of bodgery and post mortem
analysis and look at this.

It all depends on the expected failure mode of a transformer, correct? Two
main possibilities he open windings, or shorted windings (or I suppose
a combination). Obviously not an open winding, so probably shorted ones.



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

Think " vertigris " .....



...... Phil