I have heard that ARC drove the tubes really hard in the SP-10 but not so hard in the 11, but do not have personal experience. For the same money if you are patient you might find a CAT SL-1, with which I have had over 25 years experience. It's a wonderful preamp with a first rate phono section. All I've had to do to it is replace one capacitor in the power supply and that only about two years ago. And I bought mine used.
Happy shunting.
Happy shunting.