Tabl10, I knew that BAT had purchased a lot of the 6H30's to provide to their customers of which I'm one--I bought a new VK51SE from them. Are you saying then that the tubes you buy from BAT are a different "vintage" and sonically better than what you would get from, say, The Tubestore? I'm still a little confused and have missed it if this is common knowledge. I think BAT is great to deal with but it's a pretty substanital outlay to retube with them. If they are in fact a better tube I would pay the extra and buy from BAT when the time comes. Thanks to everyone for responding.