Microwave Capacitor Value

I recently found a really nice microwave+convection oven in the trash, it was less than 2 years old and looked like it was worth trying to fix. Unfortunately, someone had stripped all the wiring and some of the HV components - perhaps to keep someone else from getting any good of the unit. But that never stopped me before, and I set to work rebuilding it with components from other microwaves. A schematic on the inside cover greatly helped, and now I have it going and it seems to work great. However, there's one thing I want to make sure of. The HV cap had been removed, and the value was not marked on the schematic. The magnetron is a 2M253K(JT), and the specs on the back gave a power output of 900 watts and peak voltage of