hi there! i just bought a numark tt1650 and an ortofon arkiv cartridge, connected it properly to my old technics a700mk2 amplifier (phono, grounding and all that) but it still has a buzzing problem especially when turning the volume up. it's not that really loud buzzing you get when you disconnect the ground wire but it's still very annoying and gives you a headache when listening to records. got any ideas on what could be wrong? could it be a problem with the electrics on the amplifier, the whole back phono entrance situation?