MCS was the house brand for J C Penney stores back when they used to sell electronics. They quite in 1987. It was probably made by Technics and is comparable to any other Japanese dreck from that period.
Ditto to what Infinitebaffle says, but I think they may have been made by Pioneer....or both. I remember some of their receivers looking jsut like Pioneer receivers. Can you believe MCS and LXI ala Sears was what I had to pick from for hi-fi as I went through adolescence?