Turntables "typically" like shielded cables. Did your custom WE cable have a ground wire?
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OP: would you please explain your rationale for opting for a selecting vintage WE wire for IC materials? It obviously works for you CD player, so nothing appears wrong with it. Just curious.
As for the hum and noise, try grounding the WE IC at the preamp’s ground post. Check for local ground loops in or near your turntable.
I am a cable manufacturer. (Bionic Cables)
We do not make a phono cable yet so I am unbiased. lol
What you are hearing is caused be one or more of the following. Lack of a dedicated, balanced shield, potential between ground and shield, or impedance.
Cartridges are transformers and naturally balanced with no common ground.