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 also looking for the screws of the meter that are missing; I measured the other similar on the top cover and are 0,135 inch.
I can't find the commercial types.
Someone can help?