Face, you have a point. I would love to see the same testing done today. Today the solid state is better, the tube amps are better, and now there are T-amps and class D. It would be very time consuming but entertaining. I had to swap out my Bel Canto M300s and place Outlaw Audio M200s in their stead for 3 weeks. The difference was very clear and persisted until I replaced the BC M300s. I could have picked out those two from each other, but I'm not sure about any others. I was so used to the BCs that any change would have been noticeable. I think it would be more fair to say that if one stays in the same topography, be it solid state or tube or IC, the differences are slight. For me it is much easier to tell the difference between SS vs tube, or tube vs tripath or IcePower.