I tried recently, to get at the difference between these amps. According to the Stereophile review, a Rev B amp is on par with the new design. According to Steve McCormack, who admittedly "danced" around my question, it might take a Rev A upgrade to get at the new design. It might be that Mr McCormack's interest (financially) in McCormack Audio, and in SMc Audio may cause problems with his recommendations of either one over the other. This is only speculation on my part. Mr McCormack was very, very helpful with my questions. He wrote two emails to me in extreme detail. However, I am no more sure of the differences now than I was before. Perhaps it really is not "better" but different.
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