• 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.

Ground lift switch wiring

Hi.

I've recently done some work on my valve amp.
I needed to remove the main circuit board so I could install new valve bases. I (thought I) took pics of all the wiring etc however I'm left with one unidentified wire which comes from the ground lift switch.
The other wires from the switch go; one to the chassis and one to the volume pot (case).

I'm guessing the remaining rogue wire should go to the negative side of the main PCB ?

PXL_20250101_153237269.jpg