I like tubes with Scalas, but from your list I'm guessing you're avoiding them(?). I've tried them with an Aleph 5 and preferred various tube options to that combination, but the Aleph 30 and 3 are reportedly better than the 5. Best thing to improve the Scala's is to get rid of that mediocre tweeter and put in something better like a Beyma or Fane: My experience is with vintage Scalas and not with the Scala 2, but I don't think the tweeter's changed much. Of the SS options to go with the big Klipsch Heritage, the best I've heard is McIntosh - but you're already doing that. Haven't heard the others you are asking about. I always came back to SET amps, but they're not for everyone, and not optimal for all types of music.
