Well, leaving aside the sanity of spending 10x the amount in tubes as on the amp, yes, life is unfair; change is the only constant; you have to break eggs to make omelets, and all those platitudes that you probably don't want to hear. So, here's the deal: we changed tube type (from noval, 6DJ8-family tubes, to octal, 6SN7-family tubes) because they sound better and perform better. In fact, the 6SN7 tube family is one of the most linear tubes ever made---s evidenced by the amazing performance of Lyr 3 in high gain mode.