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  1. Vacuum tube - Wikipedia

  2. Vacuum Tubes: The World Before Transistors - Engineering.com

  3. What is a Vacuum Tube? - Computer Hope

  4. Vacuum Tubes Radio Tubes - 5,000 different tubes in stock

  5. The History and Importance of the Vacuum Tube - ThoughtCo

  6. What is vacuum tube and how does it work? - Physics Network

  7. Electron tube | Vacuum Tubes, Cathode Rays, & Applications

  8. www.thetubestore.com - Vacuum Tubes, Matched, Fast Shipping

  9. How Vacuum Tubes Work

  10. Vacuum Tubes: Episode 1 - The Basics and the Diode - YouTube

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