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What are vacuum tube devices?...

What are vacuum tube devices?

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Vacuum tube devices are those devices in which copious electrons are obtained by a heated cathode and their flow is controlled by varying the anode voltage.
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Knowledge Check

  • The advantage of BJT (Bipolar junction transistor) over vacuum tube triode is :

    A
    BJT is cheap
    B
    It is less bulky
    C
    there is no heating element in it
    D
    all of the above
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