• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Audio Research SP-11 HV Regulator

Getting back to this. Here's the HV Regulator in its original form:


When I ran the bode plot, it looked a little lumpy and I thought it might be overly fussy compensation and snubberizing. I eliminated these networks a la, and added compensation to the lower leg of the potential divider:


So here are the before and after bode plots: