I've worked on both the SP-11 and the SP-10 extensively. The SP-11 is probably a bit quieter in the phono stage then the SP-10. Both are marvelous preamps. Both bench test very well. Before comparing a new preamp with a rather old preamp one would have to recap the old preamp. That way you are comparing apples to apples. After 15-20 yrs, both preamps should be recapped before any serious listening comparisons take place.
