I suppose in addition to the Levinson mentioned above something from Classe or McIntosh might work. For some reason I'm having a really hard time thinking of a ss preamp that will do what you're looking for (I've got a BP-6 by the way), but on the amp side I can think of several. I don't know much about your amp or if you'd be willing to look at switching that instead, but in addition to the brands mentioned it opens up ss possiblities from the likes of BAT, CJ, etc.
Also, you don't mention what you're using for interconnects/cables but that might be yet another avenue to explore. Best of luck.
Also, you don't mention what you're using for interconnects/cables but that might be yet another avenue to explore. Best of luck.