I've been enjoying my Crack + Speedball immensely over the past weeks and have been playing around with tube rolling to some degree. I found a NOS Tung-Sol 6080 that I really love, and I've tried two different 12AU7s in addition to the stock tube. One of them is my favorite as it noticeably adds some air and high frequency extension. Today, however, I finally received my 12AU7/6SN7 adapter from China and was able to try out a vintage Tung-Sol 6SN7 that I picked up from a local tube seller.
Oh. My. God.
I think I'm in audio nirvana! My rig has NEVER sounded this dynamic or detailed. Soundstage seems to have almost doubled. Air and separation around instruments is much, much better, and there is some serious PRAT happening as well. The Crack sounded fantastic before, but adding this 6SN7 to the signal path has just opened it up and elevated the listening experience to a whole new level. This is probably the most blatantly apparent improvement I've ever heard from a tube roll. I think that little $14 adapter just saved me a whole lot of money, because I can't imagine this particular audio chain getting much better than this. It looks a bit ghetto compared to having a 12AU7 alone in the socket, but I think I can live with that.
Sorry for gushing, but I'm sitting here almost stupefied after listening to some of my most familiar test tracks for a half hour. So much for the list of chores I was going to get done today!!
Edited by swmtnbiker - 3/23/13 at 1:56pm