Good question, most likely a combination. Pure speculation, but maybe the interstage capacitors needed some burn-in time to open up. Thanks for sharing your experience with tube rolling. Using the magic 8-ball, I don't think tube rolling will change my overall opinion much. I rolled the stock tube, a NOS 6N23P-EV, and a GE 5670 with adapter. The differences were subtle, an order of magnitude smaller than the sonic changes I observed rolling tubes in Vali 2. If no one buys my combo unit, I will turn it into a little project. My hunch is that rolling interstage capacitors would make a much bigger difference than rolling tubes. To my eye, it looks like they used some cheapo knockoff WIMA caps. (Edit: They're WIMA, see dBel's post.) I wouldn't spend more than a few bucks, but I'm curious if those green Russian PIO caps would sound any better.