You get the best of both worlds when you use tubes and solid state together. You get the sweetness of the tube preamp and the tightness of the solid state amp in the bass region. I'm using a Adcom GFA 535 (original) amp with a Tutay Modified VanAlstine Super PAS3si preamp. The sound is excellent. Very detailed and no solid state glare or harshness. Depending on which speaker you use Adcoms can be a bit forward sounding. I'm using Apogees Centaurs hybrids and Spicas. The 545 is considered one of Adcoms best sounding amps. It should be a nice balance depending on the speakers you choose of course and their placement.
Tube preamp integration
Has anyone use a tube pre with a Adcom GFA-545II and if so how does it sound? I am planning to get into tubes for the first time.