Anyone listen to Zu Audio's Definition Mk3?

The Sophia 845 current chassis are 206-driven and tube rectified. I don't think they offer the 6sn7-driven version (at much lower cost) anymore.

When both versions were offered, the gulf between the 6sn7 and 206 versions was very wide. The 6sn7 version of the Sophia 845 was a fine amp but not exceptional. The 206 driven circuit is much more energetic and toneful. Like most amps that are tube rectified, the tube rectifier is a real point of tunability, with substantial effects on dynamic performance, macro/micro dynamic perceptions, tone density and degree of slam.

Phil

Form factor changed a couple years ago. The current website shows my amps as they appear in front of me. The new chassis is much larger with no wood caps.

I have only seen "old chassis" versions appear on Audiogon, hence the reference.

FYI- I believe a Berkeley run direct to go tube amps is a stellar combo (if you don't do vinyl)

That is my current setup, though will try a Mac C2300 preamp in front after the amps are broken in.

Keith, other than the Mac and current amps, what others have you tried on the Zus?

Keithr,
I believe your DEF IV and Sophia 845 SET pairing will provide you with stunning musical realism and 'natural' beautiful sound. In terms of resoulution,nuance,tone/timbre and dynamic ebb and flow you will have sublime results. I look forward to your future impressions.
Regards,