Aesthetix Callisto owners help please


I'm contemplating this pre and would like to get input from current owners on sonics with and without any tube rolling. I may or may not get the chance to audition locally, but have spent time with a Janus and have some grip on that sound as a point of referen

Associated equipment
Moscode 401HR
Dunlavy SCIV-A
CEC TL51X into Genesis Digital Lens into Modified DAC60 as source

Thanks
arthursmuck
There was lots of info about the Callisto written. I use a Callisto Signature and I share the opinion of Cmo.
I also use NOS Tubes and it is an improvement but even with Stock tubes it is really good. A real amazing good unit.
The Callisto's output impedance is 300 ohms unbalanced, 600 ohms balanced. Email Jim White and I'm sure he'll give you the full spec rundown.