This video titled "Journey to the Center of a Tube" is about vacuum tubes that are used in guitar amps. It was created for The Tube Depot and the demonstration animation in this video was done by Jay Phillips using Blender. For you aspiring Blues guitarist, the 6L6 tube gives a nice warm tone and is used in many guitar amplifiers such as Fender and my favorite, Dumble.
From the site" "Your host Robert Hull takes you on a journey to the center of a tube. You will be astounded at the beauty of this SED 6L6GC tube, so close you can almost touch it. From the outside glass to the deepest filament, see every element in vibrant color ... just please, refrain from feeding the electrons."