Ran one for years, mostly with Manley Mahi Mahi mono blocks to great affect. This is a sweet preamp with lots of drive. Moving from the stock tubes to upgraded will improve its performance. Upgraded power cord will improve its performance. Placing it on a very decent stand such as a Quadraspire SVT will improve its performance.
This is a very sweet piece for the used cost of around $2,000 And it's just cool retro. Why do I not run it now? The tube preamp is simply just not fast enough for my active tower speakers. Best of luck with one.