Had a few minutes to putz a round this morning and plugged the LP Triumph into the B-15 (using my new Ampeg 15" cab for practicing at home). Wow, what a kick butt sound with a tube amp and the LP low z pups and flats.
I've been on a search to find a good combination with the tube amp and bass. So far, the ThunderJet, an anniversary j-bass and the Triumph all sound fantastic through a tuber. I tried my 60's NR and 68 Tele bass and they sound really good, but I'm struggling with the thick necks. Heck, probably about any bass sounds good through a tube amp if dialed in the way you want it.