Checking in with a beautifully quiet, black WA6-SE ... Just for kicks, I rolled in the "stock" rectifier tube -- I use a Sophia Princess normally -- and I have to report: What a great amp!
I thought I'd perhaps hear some sign of a "cheap tube" ... nope! It sounds great. Maybe going back to the Sophia, I'll notice the character difference between the two.
By the way, I'm running a pair of GE 6DR7 ... and LCD2. (which reminds me, I've not ever tried the combination of "Woo stock" 6EW7 with the stock rectifier ... maybe tonight!)