Oh, how I remember! During the days of vacuum tubes you had to keep a basket on the top of your television set. Once a week you would use that basket to carry all of the tubes in the television to the nearest store with a tube tester and weed out the bad ones. Back then, a sharp rap would often fix a radio or a television's trouble.
Clipped from Girl Genius Onlinescrubbed and enlarged using The GIMP.