I just bought a McIntosh MX112 and MC2105 amp. They appear to be in 8-9 condition. I have hooked up the speakers. The left speaker hookup is intermittent when I tighten the 8 ohm connection. When I back off the screw it works. However the right connection I am getting nothing. Any tips on wiring these. I am used to the banana plug configurations which make for easy speaker hook up.