My Nakamichi AV 2 1999 vintage has been sitting most of the time because some of my listening involves my old vinyl LP records. My Nacamichi does not appear to support my turntable. Am I correct; is this so? I tried the AUX port, CD and others but nothing worked. Do I need some kind of pre-amp for my turntable to work with this receiver? How and what to do? Thanks, Easy...