I had gone through probably a dozen pre amps and finally just got an aesthetix Janis signature and was quite content until one day I walked into see a movie (James Bond) with my wife and an aesthetix calisto eclipse came up. I had only seen one or two come up in the last few years, but this was in excellent condition and had the single power supply with the reinforced case. As the light dimmed, i couldn’t stop thinking about it, so I snuck out in a slow passage and just bought it. After selling my Janus Sig it only cost me $600. It has stayed in my reference system for the past 5+ years and has satisfied my need to look around. The only thing I can see is that I have been looking for an Io without volume to pair with my callisto.