I used to have a B&K 2220 (and other B&Ks) that I ran with a 1990s Conrad Johnson preamp and a newer Jolida tube preamp and it sounded great with both I thought, but the newer Jolida was better and they are pretty cheap. I also ran a Classe' solid state preamp with it and I preferred the tube preamps with the B&K amps. I grew up with B&K power amps, I really like them.
I thought the music sounded 'fuller' with a tube preamp and it slams just as hard but more musically, imo. I like the tube preamp SS power amp setup. Good luck!