I'll contact Mr. Wyatt and pick his brain. Thanks for the tip. I emailed Boris at Vista to see if he had any interest in designing a mono pre. He has done such good work with the his stereo phono pre's at an intro level price, I thought I'd see if he might do something similar with mono. He said that the curves were so highly variable that it was hard to get good info on the early 50's to late 50's stuff. He had looked at it and decided not to pursue it. I've got the G.Slee unit coming next week and will see what it yields.