Leo at Orchard Audio rolls his own. He designed his own modules. Doesn’t use the Ice/Purifi/Hypex that a lot of vendors repackage.
This video provides a good breakdown of the products. A future upgrade for me is to get a set of the OA monoblocks.
The Starkrimson and PS Audio BHK Pre have dethroned the Kinki Amp as my favorite. Although i’m listening to Sonny Stitt ‘Blow the Blues’ via the Kinki right now and it sounds fantastic.
I’m sure all this gear sounds great. I haven’t heard it all, not even close. Maybe I have to get a YouTube review channel.