BRAVO! Why Are Vacuum Tubes Called Valves

So tube or vacuum tube describe what the thing looks like or is. Vacuum tube is good too because they have the vacuum as you said.

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Why are vacuum tubes also called valves.

Why are vacuum tubes called valves. They are indeed tubular. It describes what the things does in an amplifier. 1 A Because they can amplify the weak signals and make them strong.

But the word valve is functionally descriptive. The valve allows a big DC current to flow from cathode to anode.

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