What do vacuum tubes (valves) do?
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Building a Tube Amp! Does it produce better audio quality though? EB#47
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How Tube Amplifiers Work, Part 1: The Power Supply
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How To Use Your Tube Amp At Home (and NOT get divorced)
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Vacuum Tubes Basics: 10 things you need to know
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Why do tubes sound different than transistors?
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Vacuum Tubes Explained! How Do Radio Tubes Work?
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The Vacuum Tube and the Invention of Radio
16:11