[Radioroslyn]

Or you can remove the 80 tube. Use your AC voltmeter connect one lead to the chassis. Use the other lead to measure the high voltage at each of the two smaller pins at the 80 tube socket separately. Should see about 300-350vac on each. This also tells you that the bias resistor is ok (the big one connected the the center tap of the hv winding).

I rarely measure power transformers unless it has signs of significant overheating (wax or tar on the wood under the transformer or has a burn smell). Output transformers if there is no audio at all. Ant and osc coils on pre 1937 Philcos or if there is a problem.