Here is the interesting thing about listening to a system and then commenting on the quality of different tested components. As you all know I am comparing Cast duelunds against hovland music caps. On my big system its easy, because you can hear a fly landing on the speaker box or even a half deaf audiophile coming through the front door, the smallest change via even a piece of wire is audible. But on the second system consisting of a great sounding set of Quad 57s topped with Linauem omnidirectional tweeters, leak stereo 20 Rebuilt with quality hand picked parts and also armed with great valves, stepped resistor volume control, plus a very good sounding expensive professional pioneer DVD player. Now here is the problem when I change parts cables caps resistors it's very much harder to pick exactly what is really going on, there is a equalization of the playing field, differences are somewhat nullified. The differences are there but can we use this information in a real tangible way. So the question needs to be asked, is any of the results even valid, Could anyone build say, incredible sounding amplifiers or preamps if they did not have a great sounding setup, do you need a real sounding system to actually hear the truth. Well all I can say (with this Quad setup) is that i could build a great sounding amplifier to suit the quad 57s. But I could not make with certainty a universal, magical sounding world class amplifier. If we where to do some blind testing of parts, via this system can we really predict anything representative of the truth. Well my answer is, not much chance.