The AUT 2000 has four settings; +22dB (x13), +26dB (x20), +28dB (x26) and +32dB (x40). Impedance for each setting is 278Ohm, 117Ohm, 69Ohm and 29Ohm respectively, if I remember correctly.
lewn, I have wrote about impedance of cartridge coils - 30 ohms. Manufacturers do give recommendations (sometimes) about that also. Of course we can say no to it.
As about your example yes it's possible to change 47k ohms resistor into 68k ohms but I don't think that user will want to remove it from Allnic H-1202 and solder 67k into the place :)
FYI the ML is $1200 and has a middling output (.4mv) that might be a less than ideal match for some phono preamps. it also has an aluminum cantilever. hearing it briefly it has a channel imbalance and sounded a little brighter than my preference- also a higher amount of surface noise. I'll take the ART9 any day of the week.
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