This is a quote from someone at CanJam. Does anyone know what he's referring to? I'm assuming he's talking about the WA7 but I have not heard of any changes to the power supply.
Woo was showing off a tube power supply for the WA7 using two 12AU7 for rectification. The concept was demo'd as a separate box that looked identical to the WA7 (the prototype still had a volume knob!). They are developing this as an upgrade for compulsive tube rollers, since the 6C45 gain/power tube of the WA7 only has 2 current production options and apparently doesn't satisfy those with the itch to roll. Speculated pricing was $300 and is preliminary.
I can confirm that in their demo setup (with hifiman HE-500s), the tube power supply clearly sounded different (fuller with less grain and etch, but possibly with less detail.)