The following is a work in progress. This is based on the Powerman by Mark Lavelle, but I have markedly changed the voltages and resistor values. The resistor values are based off the Sylvania data sheets, at 100V B+. This amp won't have much head room!

Other changes:

Used a transformer that has a lower filament current, so no voltage dropping resistors should be needed.

Increased resistances in power supply to improve filtering. Values now correspond to recommendations in “ Valve Amplifiers, Third Edition ” by Morgan Jones, 3rd ed., page 326: for 3 section RC filter, 60 Hz supply, use R*C per section equal to 13.3 kohms * μF .

Schematic