I recently added a monster power conditioner to my system and I was rather surprised at the results. (http://www6.head-fi.org/forums/showthread.php?t=168069) I wasn't expecting much if any improvements as I purchased the power conditioner mostly on impulse. It made more difference in my system than I've ever gotten from swaping out ICs or changing tubes (although my hybrid isn't all that responsive to tube changes). I am curious to hear others thoughts about power conditioning.