Since my last post here I've changed to (new Russian) Gold Lion KT88s and I like 'em better than the 150s…or I've grown up, although that's not likely. Groovy "exploding on start-up" Kevin Deal sourced gold pin Mullard 6201s (12AT7), and new version Gold Lion 12AX7s round out the tube contingent. My comparisons of more pricey tube amps in my system, albeit not integrated amps, has demonstrated that common sense says no…my (factory upgraded) 502P sounded as good (or better in some cases), or maybe the stuff I use with it is so lame it brings other amps down to its level and common sense isn't there at all. It's a sham, and I'm a fraud…but I like it...