05-14-10: WindowsxNot to dissuade you from solid state, but the Spectral amp specs suggest it would work fine with a tube preamp.
I personally prefer fully balanced solid state preamps at the moment since Spectral can be no good with tube preamp from my past experiences.
Can you be specific about what aspects of the tube preamp/Spectral combination you did not like?
What tube preamp was being used?
Lastly, since you seem to be headed toward a new preamp regardless of whether it will be the best solution for your bass issues, I would encourage you to try and audition the SMc Audio VRE-1. It's fully balanced, quiet as outer space, and would work well with the Spectral amp, IMO.

