Ok so i have a project debut 3 turntable with the standard ortofon cartridge, but i also have a spare linn adikt kicking about. the reason that i've not fitted it is that when i do i get really bad mains hum coming through the speakers. does anyone have any suggestions as to what could be causing this? everythings earthed (or at least the cables are attached, i cant check if there is a break). and there's no problem when the standard cart is fittted. it's kind of a shame to have the thing sitting about not being used.