Gene Marcus wrote:

The original transformer is still there, but the primary is open.

That's harder to fix yourself than the secondary, unless the open is
right at the end of the wind in the lead-in wires. But you CAN rewind
it by hand on the bench if you're patient, or you can pay Peter Dahl
company to do it for you.

The primary winding DC resistance on one of the other identical good
transformers measures 870 ohms. With a primary rating of 10MA it is a
low power transformer measuring 2 x 1.5 x 1.25 inches.

Any idea what the actual impedances and ratios are? If you put 6VAC
into the primary of a good one, what do you get out the secondary?

It should be no problem to use an off-the-shelf Triad output transformer
IF the ratio is close to that of a standard transformer. The real problem
is that 10MA DC-leakage thing, but that's not insurmountable.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."