I need let you all know that our two transformer vendors are out of stock (and have been for many weeks now) and neither have any idea when they may have more available.
Thus our Ultravalve amplifier is now listed as unobtanium, in the same catagory as AKM digital chips.
If we ever have access to a reliable source for more power and output transformers, we will build some more Ultravalves. But for now its impossible.
Frank