CAT JL-2. Not clear if you are still in the market and I would not want to spring for any tube amp of the size you will need without auditioning it with your speakers. Having said that, I've not seen any tube amp (or most SS) that handle difficult speakers like a CAT JL2. You are looking at a big, heavy, hot amp but it handily outclasses anything I've heard on my Apogee Diva's (and before them, Infinity Beta's). At one point I used it to drive some older speakers I built with Strathearn ribbons (1.1 ohm load). Have never heard it sound less than wonderful.
mbhintz
mbhintz