Depends on the design. I own the Counterpoint SA-220 modified and have heard the Butler hybrid amp. Both amps are warmer sounding then SS amps that I have heard but were not as warm and 3D as some tube amps I have heard - kind of right between SS and all tubes. You need to try out amps that mate well with your speakers to tell what you prefer in your own system as everyone has different musical tastes.
Happy Listening.
Happy Listening.