Plinius SB 300 v Plinius SA 250 MK IV

I have been a tube amp guy since 1986 and bought Harbeths a few months ago. They need more current than my Air Tight 300B can give so I bought an SA-50III. Maybe it's the Harbeths but I didn't know S/S could sound so good. Then again, maybe it's the Plinius.

I had cary 2A3s 5-6 years ago but could not find a speaker that worked. The Cain & Cains were not available then. I found the Air Tight had enough oopmh for many more speakers. I also had Cary 572s which were really good sounding but those damn tubes died every 6-8 months.