I always assumed it was a reference to the Cathode Ray Tubes of old TVs
--Darkcraft Fri, 28 May 2010 02:52:56 -0400
Well, I think that's where "boob tube" came from? There was also a movie "The Groove Tube" but I think that postdates use of the term. (Just a guess)
--Kirk Fri, 28 May 2010 10:33:08 -0400