@cdc Luxman, D’Agostino, Vandersteen (yes, they make amps), Parasound, Sanders.
When I say I can recomend them that doesn’t mean they handle all loads, but rather they are at least neutral and tonally will not cause themselves to be noticed. Amps I can’t recommend are those that to my ears are objectionable, or that have a particular type of speaker they sound good with.
Ayre is a brand I really like... but also distinct enough I can't universally recommend.