The older Sansuis are justifiably esteemed; I wish I had one. But later models, sporting the newer logo, are worth consideration, as well. About 30 years ago I picked up an AU-X619R amp new in the box from a liquidator for only $100; COMB Co. I believe it was, at the Har Mar Mall in St. Paul. I've used it on and off over the years with not a spot of trouble. For the last ten years it's been running my home theater system, as well as powering any music in that part of the house. It may be an obscure model, but it provides plenty of power, with good clear sound that I find easy to live with.