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• Vacuum tube - Wikipedia, the free encyclopedia

  In electronics, a vacuum tube, electron tube (in North America), thermionic valve, or just valve (elsewhere, especially in Britain) is a device used to amplify, switch, otherwise ...

• Vacuum Tube Valley

  All about vacuum tubes. Tube audio amp kits.

• Vacuum Tubes, Electron Tubes, Tubes, Tube Testers and Electronic Parts

  Homepage for SND Tube Sales ... Enter Ebay Store. SND Tube Sales. Michael C. Marx