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 :)
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 :)