I have seen the WATT/Puppies at shows mated with tube amps that were relatively powerful (no low power SETs). I believe they are particularly good matches in the midrange and highs.
My personal philosophy is that dynamic range is very important to my sense of fidelity. Therefore, although my WATT/Puppy 6s are pretty efficient, I am driving them with Pass X600s (600 wpc). I regard Pass solid state electronics as enjoying some of the favorable sound characteristics of tube electronics without giving up control in the bass. The match works for me.
My personal philosophy is that dynamic range is very important to my sense of fidelity. Therefore, although my WATT/Puppy 6s are pretty efficient, I am driving them with Pass X600s (600 wpc). I regard Pass solid state electronics as enjoying some of the favorable sound characteristics of tube electronics without giving up control in the bass. The match works for me.