[WallaceRoger]

OK, here's my progress so far, and thank you for the help.

1:
* Field coil: I did what Terry suggested earlier in the thread and I get 240 ohm and 210 ohm for the first couple pins, the third pin gave 3,230 ohm)
* Part #27 Choke: 436 ohm

Since they weren't zero, I'm guessing continuity is ok (not sure about the one higher reading)?

2:
* Tested output transformer. One side gives me a zero (the one that connects to the 71A closest to the antenna terminal), which means it's open? What's a good replacement part for this?

I stopped at this point. Need some clarification so I don't kill myself.

4: Leave all other tubes (except 80) in for this? Which pins do I use for the filament test (the two larger, the two smaller, one of each, or doesn't matter)? And how do I know which pins are 1,2,3,4 (start bottom right and counterclockwise to bottom left)?
5: Need to know which pins to use for filament test (or if it doesn't matter)
6: Hmm, so I'll use the chassis for ground and which of the pins do I check for the plate voltage? (Is there a handy diagram someplace that shows which is which for various tubes? I do a lot of referring back to reference materials while I'm working).
7: This is done at the power supply? Which point?
8: Since tubes are left in, I'll do this from the underside, correct?

The speaker cord does have some of the wire shroud rubbed off where it was pushed against a wall for many years. Before I do anything else I'll fix that issue.