[mark123]

Thanks for the input gents.

Regarding Terry's comments, I am able to measure resistance from the green wire (center tap) to each yellow wire. I get 90 ohms on one and 97 on the other, which is fairly close to what is shown on the schematic. No surprise, I get 187 ohms yellow to yellow. However, no continuity from yellow to yellow, or green (center tap) to either yellow.

I can't check the cabinet for a blob of wax, since this was a chassis-only acquisition. I did take the covers off of the transformer just to peak at the wires to see if anything obvious stood out. Nada. Nor did it appear like any waxy substance or anything for that matter dripped out. It doesn't have that acrid, sulfur-like, nasty burned-electronics smell that is hard to forget. Just that warm, nostalgic, old-tube-equipment smell from the vaporized dust, oils, maybe even the varnish from the core plates? "Eau de old electronics" if you will.