Gemini XL-500 Turntable "earth cable shielding" Questions

pick up signals on the leads. Rerout the leads. Also possible are earth loops from other units. On one of my players I had to bypass the negative lead on the RCA cable ie cut the shielding to negative

...bottom of my amp, without any success. I am considering replacing with shielded cables (again non-earthed because i am yet to run into these), but could it be the mains cable that needs replacing, ...