@yyzsantabarbara not all GaN amplifiers are Class D. Take a look at the Gold Note PA-10 I have two operating in Bridged mode with an SPL Phonitor 2 as a preamp and they are spectacular.
I also agree that the Bel Canto products are well built and sound great.
https://www.hifipig.com/gold-note-pa-10-power-amplifier/
The PA-10 features quite an interesting design. It is not a Class D amplifier but it leverages a new technology that uses MOSFETs for the output stage, in common with the Class D, featuring an output oscillator (GaN Mosfets with Gallium Nitride), a proprietary design that actually doubles the power of the amplifier when reducing the impedance – exactly as a pure Class A but with extremely high efficiency to deliver great amounts of energy.” So there you have it.
https://positive-feedback.com/reviews/hardware-reviews/gold-note-pa-10-amplifiers/
What may surprise you is despite its great power for such a small box, it's not a Class D amplifier.
"It's actually an A/B amplifier, but it uses a switching mode digital power supply, which allows it to get more power in a smaller chassis,"