Funny and interesting side note. I flipped the switch on Valhalla to off to put it to bed for the night. The front not panel led remains lit. So I wait.... still lit. I pull the power cord out thinking maybe the switch only turns off the tubes. Still lit. WTH? I come back 5 min later, still lit. Umm ok, now there is a robust power supply with serious capacitive reserve for a little headphone amp!
Explains the crazy good slam this triode OTL is capable of.