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.
Is there any substitute of EL3 / EL3N tube (old radio power tube).
Could I convert it e.g. to EL34 using proper socket and wiring (from EL3N to EL34, adjusting e.g. heater pin, anode, cathode, grid etc).