I have a rather nice SAEC XC10 cartridge fitted to my Victor QL A95, I am currently hooked up to a vintage Pioneer A8 amp and have noticed that when I switch between the mono and stereo setting I lose sound from one channel. The thing is, when it’s set to mono I get both channels and only one when on stereo. I attached a VM95SH, changed the pre amp to mm and get both channels when set to stereo. So do I have a very nice MC cart with a fault? (It sounds great when on mono though!)