I have an AT20SS cartridge and a Soundcraftsmen Pre-Amp with the dip switches in the back for matching the capacitance of the cartridge. The book for the AT20SS shows that the inductance is 450 mh. The back of the 4200 is looking for a capacitance value in pf. I'm not finding the pf value for this cartridge anywhere. Does anyone here know? Should I putz with it and see what sounds good? Thanks!