Really? Is that true (echoing Chris Farley)?Tilting a tube amp makes the electrons flow from the plate towards the bottom side edge of the tube glass, then bounce back up to the grid, as opposed to falling to the center of the bottom glass before bouncing. This is a result of gravity, and creates a subtle harmonic slightly less than 3.75 octaves above the 5th element. But only if powering the amp with 110v and with a non grounded plug while playing a 50's Telecaster. And if you turn the amp upside down, as Sid McGInnis does his 1963 Fender Showman, all of the electrons are forced, by gravity, to reside entirely on the plate, where they fry like microscopic eggs into a sonic frenzy before further splitting into a macroscopic mashup of atoms on the grid, resulting in a tonal blast of near nuclear proportions, commonly called mojo.