[dseverson]

OK, guys, here are the results.

1. Oscillator coil: pins 4 and 5 = 3.5 ohms, pins 2 and 3 = 6.8 ohms

2. No hum when touching grid of 50L6 with a screw driver, powered on

3. With the power on, connected negative probe of my DMM to pin 6 of 7C6 and measured the following:
A. Positive to pin 7 of 35Z3 = 162 volts
B. Positive to pin 4 of 50L6 = infinity (? DMM kept flashing negative)
C. Positive to pin 3 of 50L6 = infinity (? DMM flashes negative)

I can't find the instruction manual for the DMM so I assume flashing negative means infinity.