[cademan]

Hi, is the so-called dead tube the high voltage rectifier? If so, you usually won't see it glow as it takes its heater voltage directly from a separate winding on the flyback transformer. If this tube were bad, it would not be the cause your power problem.

If all tubes are lit but nothing happens, it sounds like a power supply problem (B+). If no B+ is getting to the circuit, it will appear dead. Check for any fuses and any open or smoked power resistors and diodes.

Usually a power problem is the easiest to diagnose and repair but not knowing your level of expertise, it might be more in depth than you are willing to get into on your own.