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Diode Vacuum Tube

what were the most common types of vacuum tubes used?

in their hay day what were the most commonly used vacuum tubes..ie diodes, triodes, pentodes..

It would most probably be diodes, as there are most circuits use some kind of rectification, while not all circuits use amplification that is what tr/pentodes are mainly used for.

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Diode, Vacuum Tube and Solid State, Power Supply