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.
I did this for myself and thought it might be useful to someone
The actual article is available as a download off the net. Type in "Mu stage Philosophy Alan Kimmel"
I acknowledge this summary is of his intellectual property.