If you are a ROON user, then the following thread may help as a stop gap solution.
I own a Sanders Magtech amp and I use it with a Magnepan LRS+ speakers. What a combo and I am so lucky I changed my mind about selling the amp. I needed to use the Schitt Yggi+ LIM DAC to get the total satisfaction I have now with this gear.
I bought my amp used from Roger Sanders and he was incredibly helpful with my questions and demo requests. I would contact him first since your amp was used.