Reimyo PAT-777
The Reimyo PAT-777 owes its sonic achievement to the patient tuning and the perfectionist purism of Kazuo Kiuchi and his associates, who developed for this amp a number of special perfectionist features, which reportedly play key roles in its sound. For example, the internal point to point wiring does not use any solder joints (suggesting that costly crimping and welding processes were found to be sonically better). Interestingly, this single ended circuit manages to achieve its clean purity without resorting to negative feedback (negative feedback is usually needed to lower distortion to acceptable amounts, especially in the context of single ended topology, which lacks the distortion canceling advantages of balanced or push-pull topology). This perfectionist quest has produced an amp that is not inexpensive ($15,000 for the stereo unit). But sonically the Harmonix Reimyo PAT-777 stands alone among single ended 300B amps, and you won't want any of the lesser single ended 300B amps after you hear it.
International Audio Video/Review