I am the owner of a Marantz pm68 amplifier and on the phono input on the bottom left hand corner of the unit at the back I am unable to see any colour on the terminals (red/white) to correctly connect the turntable,I have connected the red cable to the terminal nearest to the earth terminal but seeing as I am unable to find my handbook I would like to be sure if I have connected it correctly. hope you can help. thanking you steve ps the turntable is playing but I just want to be sure its connected 100%