[TV MAN]

Hey all, here's another one of my wacky ideas that may or may not work. I would like to build a B+ power supply for testing purposes. I've had several times I would like to power something with a known good power supply. It would need to have enough current capacity to power something large like an amp or TV. Yet, be able to reduce for a table radio. 

My initial thoughts:

1. I'd need a power transformer with enough current and voltage, large enough to power a lot of 6.3v tubes and a couple 5V tubes (maybe). 
2. good filter network
3. various taps for different voltage take offs
3. some type of protection 

I'd want some type of bleeder resistor to keep the filter caps from holding a charge. Probably a relay to shut off the the HV when not in use (or if I see smoke  )

One question tho. I would need to make it variable B+. How to do this? If I use a variac, then that also cuts down the filament voltages if I need to use them. I would think some type of variable resistor that would be heavy enough, but with no load or a light load, how well would this work? I'm open to suggestions.