Great Thread. This is all very interesting to me having just bought my first tube amp, a Cary sli80. Ilove it, it's got 6550's, and I've been wondering whether to try some 88's. The first thing I decided to do was try different 6922's & 6SN7's. I wound up ordering some Tungsram 6922's and Raytheon 6SN7's. Looking forward to hearing a difference from my Sovtek & Chinese, at least I hope I hear a difference! The KT88's will be the next switch.
