Great choice of cdp! I have had one for a month now and have swapped out several 12ax7s (Tesla JJ, Sovtek LPS, EH and the stocks). I have settled on a matched pair of EI 12ax7s that sound magnificent, full and rich with great dynamics and bass. Treble and mids are the best so far and I didin;t have to spend an arm and a leg. Got them from the tubestore.