This thread, with over 500 posts I think, has allowed interested people to understand the evolution of their 300b amps design compared to other designs. A rare insight into the machinations of amplifier design, which to be honest Roger Modjeski from RAM was stellar at doing as well. Lynn astounded me with an earlier post that some designers, maybe it was with speakers, design to specs and that's it. What Don and Lynn have done is an endless process of swapping not only components, but topologies, a very interactive process, subject to both measurements and equally or more important, endless comparative listening observations. This to me is the optimum process to design gear and the process has to be exhaustive, but both Don and Lynn have done this for decades... this iterative process. And, to wit, they have shared their excursion on this thread in masterful detail to inform all of us.
My pre-pro 300b amps are a glimpse of heaven with my Cube Audio speakers and it is hard to imagine how much better they will sound when Don updates them to the final version, but I am certain his promises will be fulfilled.