Man you are smoking something. I have played dozens of amps in the last 30 years and tube power sections indeed make a HUGE difference. If you never drive a tube amps power section very hard you can be forgiven for not hearing the difference. For those of us that do run our amps a bit hard it is a very significant part of tube amp tone. I actually like to run my pre just barely dirty, and get most of my grit from the output stage. It sounds a lot bigger that way to me. There is also that output transformer squish that no solidstate amp I know of can do. Even with a tube pre, sansamp or a compressor.