Unison Research S6

After owning over a dozen audiophile integrated amps, the Unison Research S6 has been one of my personal favorites. This S6 is in great condition, is beautiful, and has been 100% reliable for me. Tubes are the originals, and are still performing like new. Have had it connected to both high and m...

After owning over a dozen audiophile integrated amps, the Unison Research S6 ...