I agree with the last suggestion, the Pass XOno should be a excellent match to the Koetsu as well. I have been running the XOno with an Allaerts which has some similar characteristics and it is a perfect balance of lushness, detail, texture and dynamics.
I think the XOno is quite underrated in the Forums here and performs much better than the $2k used prices suggest. I did prefer the Pass over several other phono stages (Sutherland Ph.D., Gram Slee, Rossner & Sohn Canofer S, Audio Research PH3SE, Aesthetics Rhea, EAR 834 Deluxe)
I think the XOno is quite underrated in the Forums here and performs much better than the $2k used prices suggest. I did prefer the Pass over several other phono stages (Sutherland Ph.D., Gram Slee, Rossner & Sohn Canofer S, Audio Research PH3SE, Aesthetics Rhea, EAR 834 Deluxe)