Classe amps work well with both solid state and tube preamplification: Classe, Sonic Frontiers, Audio Research, Conrad Johnson, Joule Electra, Audible Illusions, Pass Labs, Plinius, Jeff Rowland, Mark Levinson, Blue Circle Audio, etc. The high input impedance of the Classe amps make them compatible with most anything you want to try. As with most things you will have to try some different things to see what you like....
