[Radioroslyn]

#1  Sounds good. Field coil and output transformer should ok.

#2 If you measure the resistance at  the plug with it unplugged from the chassis connecting one of the test leads to one of the pins and go around checking the resistance of the other 3 you should have 2 of the pins that show a resistance around 200-300 ohms. This is the primary of the output transformer. The 3rd measurement will be much higher like 3500 ohms, this is the resistance of the field coil. As per #1 you have this.

*3 Don't know????

*4 See drawing

*5 Depends on what you are looking for? If you want to test for filament continuity (the part that lights up), remove the tube from the set and measure the resistance pins 1 and 4 (on 4 pin tubes) and on 5 pin tubes it's 1 and 5. See *4.
If you are checking to see if you have filament or heater voltage, use your ac volt meter across the pins mentioned above.

*6 Yes. 4pin tubes pin two is plate and this is where your find HV DC also sometimes called B+. The 80 tube has two plates (2 and 3) and these will have HV AC on them.

*7 You can measure the HV at pin 1 or 4 at the 80 tube, - lead at chassis and + at pin 1 or 4.

*8 You can't measure the filament resistance when it is installed in the set as it is in parallel with the filament winding of the power transformer. If you do it will give you a low resistance reading (the winding) and not nessescerally the filament. Other than that yes.

Hope this shed  some light on your questions.