Have not heard the BAT but I hope my suggestions can help anyway.
I heard my 805Sigs with alot of integrateds, including the MA6900, Krell, etc, and some tube stuff.
When I hooked up the Class A, Accuphase E530 or my Sugden Masterclass, I really heard nice sounds.
You gotta try it out if you can.
Accuphase has a new E550 so an E530 might come up used.
They really get warm so you would need some good ventilation.
The Mcintosh MA2275 would also be on my short list.
I heard my 805Sigs with alot of integrateds, including the MA6900, Krell, etc, and some tube stuff.
When I hooked up the Class A, Accuphase E530 or my Sugden Masterclass, I really heard nice sounds.
You gotta try it out if you can.
Accuphase has a new E550 so an E530 might come up used.
They really get warm so you would need some good ventilation.
The Mcintosh MA2275 would also be on my short list.