I agree with Tubegroover. The SA 11 was my reference preamp until about a year before Counterpoint went under. This is an extremely good unit, with tonal balance in between the ARC Ref 2 and the ART.
Considering it's age, I would ask Mike Elliott about the rear circuit board. Not only do the output tubes plug into it creating a fair amount of heat, the RCA input and output jacks also mount directly. With repeated use, plugging and unplugging, there are often fractures in the circuit track, making repair difficult. Long term use also tends to erode the circuit board quality. Mike knows more about this unit than anyone else, and as already stated, the man to see about repairs and upgrades.
I also have a great deal of experience with this product, and a lot of tube and tweak knowledge. If you get one that works properly, and you cannot afford to invest in Elliott mods immediately, I am willing to share ideas. Best luck!