For Apogees, the way to go is the H2O Audio S250 Signature. I had one running Scintillas briefly, then Duetta Sigs; beautiful combo and effortless.
Henry (the designer, manufacturer) knows his stuff combining B&O modules with a huge linear power supply. The S250 is dual mono - two transformers, huge capacitor setup, nice power rating - 250W/500W, 8/4-ohm. Henry specifically designed it for running the 1-ohm Scintillas, Duettas are a piece of cake..
No connection to seller but there's one on US Audio Mart for $2K, new modules, new wiring, as new and re-done by Henry:
https://www.usaudiomart.com/details/649632070-h2o-audio-s250-signature-stereo-amplifier-updated/If I still had Apogees I would jump on it.