Grado Black on a AR the turntable with original tonearm, slight hum when in the arm rest, gets louder as it nears the end of the record, audible when playing soft passages and between tracks.
No audible hum with M97xe.
Which is a shame, because i rather like the Grado over the M97xe with this TT.
EDIT: Ok apparently, it is humming now with the M97xe, checked all wires/connections, they're all good.
So i am pretty sure it is motor related.