I had a Revox linear tracking TT with a persistent hum issue. Because of very limited space in which to relocate it, I got this item on Amazon:
Electriduct 1/2" Tinned Copper Metal Braid Sleeving Flexible EMI RFI Shielding Wire Mesh (0.32" Diameter) - 25 Feet
It's a braided metal sleeve that you can slip over the IC. it ended up solving the hum issue...at least in my case.