re tube gear: I use the Nite Power cords and interconnects with an EAR HP4 headphone amp, and a Berning MicroZOTL, (also for headphones). The results are stunning. This cable needs time to reach its full potential (don't they all?), but once it does...
I prefer the Nite interconnects to a balanced pair of Cardas Golden Reference interconnects I was using between a Creek CD53 and the EAR. The Cardas seemed to be constricting the dynamics in comparison.