Having a preamp that allows you to change values is, for me, indispensible. This allows me to tailor the sound of a cartridge to my system and allow me to use different cartridges with out being limited by the pre amp. My experience running an MC at 47k ohms is similar to yours. I have a Benz which i run at 10K which i can't stand at 47k. I think it would even sound better at a different value but haven't spent the time yet to find it.
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