Hi
@Mudflap, I just realised that I confused two pieces of equipment in this thread.
The device with the tube is an APH-1000 high voltage power supply.
My Burleigh PZ-70 seems to work fine.
If you're still around, I have attached a photo of mine. Tell me which resistors you're talking about and I'll compare it to mine.
The two brown resistors near the top right are 50k 20W.