Exactly. Key phrase being, IMO "..not in a way that matters"! Yay! Something that's NOT just math! It's truly amazing what results you can "force" in a circuit. It's just as amazing how completely irrelevant those "forced" numbers are. It's *marketing*. And marketing has never been tied to technical precision. And output power *is* subjective as it can be changed simply via tube swaps. And if they don't list power *with* a THD number the power "rating" could reflect a nasty, coldly-distorted sound. You just can't ever correlate advertising with real-worl, practical usage. The audio world has never worked that way, ever, with the exception of scientific and some high-end audiophile products. Guitar amp marketing information is inherently "wrong" by its nature. I'm still waiting for someone to explain exactly what "maximum dissipation" of a 6V6 *sounds* like. Errr - well, I guess you'd have to pick a specific one first, right? An imaginary, theoretical one has pretty crappy tone. So does an equation. So when working to the "nth" degree to figure the absolute maximum dissipation of a pair of specific 6V6's, what is the practical audio result? How is that value used with a guitar plugged in? Because all I've "heard" are numbers and graphs. Joking aside - it's a serious question. In all the years I've been involved with this stuff nobody who fully understands the math has ever been able to provide a usable, "practical application" audio example (using a guitar and amplifier) related to precisely calculating "maximum dissipation".