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.
Years ago I asked Mike Sanders for a schematic for my KT88 amps. He claimed that he had never drawn one up except on a "napkin" and so none was available. He suggested that I draw out my own. So that's what I did...