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The plastic-roofed 'tube' at the City Road studios that inspired the name of the music show produced for Channel 4 by Tyne Tees. The Tube ran for five series from 1982 to 1987.

Image: The_JPS (John-Paul Stephenson 1999) (CC BY)

http://commons.wikimedia.org/wiki/File:Tube,_Tyne_Tees,_City_Road.jpg

(Lytebox viewer by Markus F. Hay, 2006-2012 CC BY)