Firebottle: N. A Large, Primitive, Power-hungry Active Electrical Device, Similar In Function To A FET But Constructed Out Of Glass, Metal, And Vacuum.

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:firebottle: n. A large, primitive, power-hungry active electrical
device, similar in function to a FET but constructed out of glass,
metal, and vacuum. Characterized by high cost, low density, low
reliability, high-temperature operation, and high power
dissipation. Sometimes mistakenly called a `tube' in the U.S.
or a `valve' in England; another hackish term is {glassfet}.
-- The AI Hackers Dictionary

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