I think it will depend to some extent on the size of your room and how loud you like to listen. I had Pure Audio Project Trios in a large open room, and I like to listen loud. I could listen with a 300B amp, but as the volume approached levels I like to listen at, it started to sound hard and bright. Those speakers never sounded like that with a 200W/ch tube amp. I suspect in a much smaller room that amp would have been fine but I never tried it.