I used to run Orchard Audio Ultra DMC Stereo & Monoblocks with a BAT VK50-SE for many years. But recently, I've moved onto the Black Ice Aries/DAC/Preamp driving the Ultra's. Sometimes I'll direct drive the Ultras with my PS Audio DirectStream DAC Sr. (MK1). It's fun when you have options.
The Orchard Amps are a "straight wire with gain" philosophy which will then tell you how good or bad your source is.