Since your amplifier is integrated and there doesn't appear to be a direct input to the power amp section, I don't see how a preamp tube or solid state would help.
But the amp does have a set of balanced inputs and seems to be internally balanced, so a balanced tube preamp would be a nice option as it could minimize the effect of interconnect cables on the sound. And as others have mentioned, our MP-3 preamp is such a beast and actually supports the balanced standard. The used ones here on Audiogon would be a good place to start if you go that route. Like your amp, the MP-3 is fully differential and balanced with zero feedback and a minimal signal path.
But the amp does have a set of balanced inputs and seems to be internally balanced, so a balanced tube preamp would be a nice option as it could minimize the effect of interconnect cables on the sound. And as others have mentioned, our MP-3 preamp is such a beast and actually supports the balanced standard. The used ones here on Audiogon would be a good place to start if you go that route. Like your amp, the MP-3 is fully differential and balanced with zero feedback and a minimal signal path.