"I think that's fine for those people that enjoy that, but I'm in the very substantial camp that would rather pay a designer to do his best work and buy accordingly."
Changing tubes no more invalidates a "designers best work" than swapping power cords. Many designers, especially the more prolific ones, will tell you there are many considerations when they select a tube, they don't choose exclusively based on best sound. In fact, I just had this conversation with a designer who was very enthusiastic about a tube that he thought sounded incredible in his amp but was too rare. We talked for some time about the choices he made, even in circuits, and not everything he decided was his personal choice for his listening preferences and system. He frequently made decisions calculated to broaden the products appeal.
Changing tubes no more invalidates a "designers best work" than swapping power cords. Many designers, especially the more prolific ones, will tell you there are many considerations when they select a tube, they don't choose exclusively based on best sound. In fact, I just had this conversation with a designer who was very enthusiastic about a tube that he thought sounded incredible in his amp but was too rare. We talked for some time about the choices he made, even in circuits, and not everything he decided was his personal choice for his listening preferences and system. He frequently made decisions calculated to broaden the products appeal.