John, To be clear I don't believe that an amplifier is " the key" for an audio system's success. Actually all aspects are of importance due to the fact that the "weakest link" of a system is the limiting factor. Balance of a system is no less a factor from my perspective. As we both have acknowledged there are various ways to achieve the final goal or objective. Regarding SET amps yes I do believe they are wonderful but not in an isolated sense but rather as part of a total picture concept.
Charles

