I've owned the same preamp, before getting a great deal on a SAS 10A. The 7A is amazing, and it only has one volume control, which is a plus for many people who don't want to mess with the dual mono volume controls. It also uses inexpensive tubes and the tubes last a long time in this design.
To anyone looking, this is a great design and the price is very fair. It's lower than the kit price when this was available as a kit. I've compared this preamp to more expensive models and it held its own very well. It has the transparency and soundstage SAS is known for, and is very quiet. Plus, the Jena Labs cable is a nice upgrade.
Good luck with the sale.