The 18w Luxman integrated is sounding pretty fantastic and generating excellent bass, well-controlled and accurate, with no strain. I still don’t think a 2A3 SET is right for this speaker in my room, but I question the need for more than 15-20 quality watts, and even fewer in a smaller room.There's a big difference between SET and P-P in that a P-P amp can use about 90% of its power where an SET can use about 20-25% before distortion is a problem.
I like the system to be a bit more relaxed so my tendency is to use an amp with a bit more power still.