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.
Not a bad idea. Since the CF tends to have pretty decent PSRR, you'd have to add it in judiciously to avoid making the situation worse. Yes, OT, back to the thread at hand...