• 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.

Developing a 2A3 SET

Does (1) seem like a reasonable and safe way to connect an ammeter to measure and adjust output tube plate current? Any alternative suggestions?
If you use virtual cathode for power tube, on R8 current sensing resistor can measure voltage proportional to current.
10Y DRD 2A3 SE 5k.jpg