I purchased a QA112 a couple of years ago. It was my intention to upgrade it if I liked it. In my opinion it is a fantastic pre-amp. A true giant killer. Hand built by the designer with point to point wiring. Excellent overall. I use it with a $30K system. Not that that means anything, just a point of reference to tell you how much I think of his products. I would go with the QA113 with the upgraded power supply.
