Humm from phono but not dc or aux ?

Hey guys, would anything change if I connect phono pre to pre amp with balanced cables I do have that capability ?

Quite possibly. The cartridge is a balanced source to start with- if you have a balanced input on the phono section you've got a lot more immunity to the sound of the interconnect cable- it should sound better IOW.

Some cartridges are prone to humming. Grado has a history of this.

@mijostyn To my understanding this has to do with the use of a Grado in a Rega turntable and its caused by the fact that Rega doesn't ground the motor. If you add a wire to ground the motor then the Grado works fine- and its not the only cartridge than can do this in the Rega.