A simplified version of an Ampeg Portaflex amp, roughly 50 watts output. I've tried to make as simple a version as possible while still maintaining the character of the Ampeg.
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.