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 have long been annoyed by the thin pins used on the tubes of Novar type. As europes I have some Magnovale sockets in stock and socket connections do not fit on the thin pins used in Novar tube.