I know that for some, a tube amp running all out is considered to be tonal valhalla. My question is, is it really just the tubes? Sure, I can get a hotplate, or a weber mass, and have those tubes running really hot, with a severly reduced lifespan. But, why doesn't that cranked up sound have something to do with the speakers as well? how much more are they vibrating with your volume at 0.5 as opposed to 5.0? I suppose if you try the same cabinet with a Solid state head, the difference in tone at certain volumes is more in the hands of the speakers, than it is in the head? For that cranked up tube amp tone, I think there can really be NO substitute, and why should there be? No hotplate or mass can make that cranked up tube sound at bedroom levels, how can it? If I ever go into the studio again, I know my amp will be cranked to at least 8, and there will be Rock.