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Known as `tubes' in America. Valves were glass containers where electrodes where encased in a vacuum. E.g. a diode valve would have two electrodes, an anode and a cathode there would also be two pins for the heater. The heater would `boil' electrons off the cathode to be captured by the anode (clearly this would only work one way). A triode valve would also have a grid to control electrode flow, other valves with more grids for finer control would be named according to the number of electrodes discounting the heater pins in the count.

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Q: What are valves which were used in the making of first generation of computer?
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Related questions

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vaccum tubes and valves.


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