A Simple, Valve Curve Plotter

[pwdrive]

Good stuff Mark, could a variable pot (set volts) be used at the LR8 adjust pin with that schematic suggestion of yours? I'm guessing for anode/screen voltages the HT output needs to be variable from say 50 volts to 250 volts or there about's, maximum current draw needed would be around 30 to 40 ma at most for the anode supply as a guess, it probably wouldn't be used for high power PA valves, I wish my workshop was useable, I'd have a go with the LR8/series pass combination.

Lawrence.