I have a Pioneer PL50 TT with a beige Grado MC+ cartridge. Is this a mono MM cartridge ? The cartridge was on the TT when bought at a fleamarket some 10+ years ago . I would think this MC + is from the PL50 era .Grado makes a Prestige MC+ now but its marked M+ on the cartridge body ,mine is marked MC+. It might be a MCE+1/s from '83-'84 but the AK thread is gone now . So its mostly a MM and maybe 50pf loading ?