Lots of great info here!

Some info I should have mentioned in my original post;

My T-22 is in excellent unmodified condition therefore it still has a 24 volt filament string. I have a 24 volt power supply which is capable of supplying more than enough current.

I had originally built a HV power supply using a transformer with a 5U4 for rectification. A PI filter and various capacitors and resistors to provide the necessary voltages. Unfortunately once I keyed down, the voltages sank like a rock. Some design issues unfortunately, which then led me to think about the Heathkit PS.

In any case I will be printing out these responses and items in the links for further review. At this point the Variac solution is what I will try first. If that goes well I will need to work on my original PS.

Many thanks to all and 73,

Russ K1RWT