• 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.

choke/transformers frames, where to connect?

Building a 6V6 balanced amplifier with XSM10K/10K at input, chassis is connected to safety earth but GND is nowhere connected at safety earth.

I wonder what is the best option for chokes /input transformers frames and transformers covers (steel), regarding magnetic shielding.

Earth or GND (0V) of the power supply?