Hum causes: MC cart, arm cables or phono stage ??


Dear ALL, I have a Denon D 103, Sme 309 and its cables, plugged to a brand new Phono stage from Coph Nia.
I have a consistent hum that I was not listening with my previous system (Grado cart+ Rotel phono stage).
It does not harm when listening to medium level rock music but I think it will be listenable when playing low level piano music for instance.
Shall I investigate and how in all the rest or the pre stage can have its part of responsibility ??
My feeling says that this MC cart is quite sensitive and probably the previous one (MM) was not at all.
I would like to know if the hum is due to the pre so I can try to give it back as it is new.
How can I check if it is part of the problem ??
Tks so much
ad010685

Showing 2 responses by twl

Make sure your ground wires are well connnected and have clean connections.
Try unplugging the tonearm leads from the Coph Nia, and see if the humming goes away. If it does not, then you know it is in the phono stage or cabling. If it does go away, then it is something in the cartridge or tonearm wiring.