Looked at the PCB photo Schiit provides.
I am not anywhere close to certain how their linear PSU works. It is definetly Split rail (PCB has -22 and +22V labels ), might be two LDOs per rail. Can’t make that out from the photo.
I am also not sure what component hides on the far left between input capacitors and case. Probably a bridge rectifier.
There is a butt-load of output caps. 60mF at 44V to each other would hurt, a lot (there is probably a discharge capacitor somewhere, I hope )
A pair of relays in the back (probably input switching). Case Ground is provided via a pressed-in insert to the front left of them.
The only other thing I am certain are the 20 to 30€ worth of potentiometer for volume control. Note how it is 4 modules, so a “true balanced” pot (could still be wired up to be mono )
The amplification is up to guess. I would guess discrete AB just from component count and looks.