I also own a Yamaha Clavinova. So it was natural for me to buy another Yamaha product.) In my ‘main’ audio system the amplification equipment was a Hafler DH-101 preamplifier and a Hafler DH-200 power amplifier, both of which I had assembled from kits in 1980.
https://www.amazon.com/Yamaha-S301BL-Natural-Integrated-Amplifier/dp/B00MXUCN0A