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 “” 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