Other active component principles of operation

active-componentscomponents

Besides valves and transistors…

On another question, someone talked about magnetic amplifiers, but they are slow.

Are there any other kind of "would-be" transistors out there ?

A transistor that does not work on semiconductor principles, nor thermionic emission principles, does another principle of operation exist?

Best Answer

Other possibilities are parametric amplifiers, tubes that work on ionization principles rather than thermionic emission (eg. cold cathode thyratrons, krytrons), spark gaps (as used in Marx generators), relays, motor-driven variacs, etc.

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