
The vacuum tube has an official "birth date" of November 16, 1904-- invented by British engineer John Ambrose Fleming. Thanks John!
Largely obsolete for most of it's previous applications, the vacuum tube retains a position of high esteem in the mind, heart and ears of the guitar player. "Even-order" harmonic distortion folks!
Click Here for a directory of tube info., resources and suppliers.
Tube birthday history links at Neatorama.