The current version of your cart. is low output - 0.4 mv. Assuming that's about the same for your 1990 model, you will need to use a step-up transformer to boost the signal from the cart. to get good results with your MA6300. I've been using an Ortofon Jubilee (output = 0.34 mv) with my McIntosh C-15 preamp and an AudioNote AN-S2 step-up tranny for many years. Sounds pretty good to my ears.
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