Atmasphere points out exactly what my experience has been. With my Manley mono's, with speakers that don't need more than their 100 triode watts, triode always sounds better; including in the bass. Speakers (my Stax F81's) that suck up as much power as I can give them, pentode "sounds" better; but, only inasmuch as not sounding limited in volume and dynamics. As far as refinement, staging, and all that other good stuff, triode still sounds better; albeit at limited volume.
