Apart from Audiofool's usual nonsense, the key issue here is explanations for why some components sound better than others. Electrical engineering has some concepts that can be used in such explanations based on age old science. In science our understanding advances from observation and experiments centered often on assessing hypotheses. In engineering you apply the relationships that have been supported by science.
All of this is of little import for making decisions on buying equipment. If someone finds the equipment of a designer to sound good, let her buy it. For the engineer designing an amp, there are many considerations to weigh. The very best parts in a classic circuit may sound wonderful but be unaffordable. The designer optimizes the known parameters as he sees fit. This is not science; it is the use of science.
Since designers here have attacked Roger Paul, using what Detlof calls "currently terminology" saying that they don't find his attempt to explain how his circuit works. One would think that they could defend why theirs does, but they have not.
All of this is irrelevant, if your focus is on the observation that this amp and linestage sound extraordinary. Something must explain this. I merely suggested that people hear it. If they don't like it I would be shocked, but that is their business, not mine.
I don't care two figs whether they can accept what Roger says because I know full well that their understanding of what makes for a good sounding circuit is limited by our understanding of nature's principles. With time we will further understand these principles, but regardless, Roger has found a circuit that works.
I have, of course, said this several times, and so I need not say them any more.