An 8-tube module from a 1954 IBM mainframe examined: it's a key debouncer
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The Best Breadboard for Vacuum Tube Circuits.
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Vacuum tube - Wikipedia
ECH81 Vacuum Tube, Packaging Type: Single Piece Pack
Vacuum tube - Wikipedia
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Tube Lab - Vacuum Tube Audio Amplifier | Discrete Semiconductor Circuit Projects | Electronics Textbook
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Vacuum tube - Simple English Wikipedia, the free encyclopedia
