[Silicon]

The large carbon rod resistors use the 'Body - Tip - Spot' paint code.

The 330kOhm one seems OK. If there is no extra spot on the other resistor, it should be 470kOhms.

You could check the all valves individually for continuity across all combinations of valve pins to see if there are any heater - cathode shorts, etc.

Test it in stages. Make sure the metal case has continuity with the mains plug earth pin.
Remove all valves and test transformer generally. Power up using a lamp limiter.
Measure negative bias voltage.

Then add the rectifier and test the HT voltage across C1.

Then add one 12E1 valve, set voltage knob half way, turn on and check various voltages.

Ideally you don't want to be using test lead probes on a high voltage device like this.
I attach meter leads fitted with insulated croc clips to the circuit and then turn the device on.