One of the mysteries of the English language finally explained.
1A valve oscillator having two closely-spaced grids with an alternating electric field between them, through which electrons pass twice, once in each direction.
2An oscillator consisting of a resonator (a tuned circuit) and an active device such as a transistor connected in such a way that instability in the latter causes oscillations to build up in the former until stability is reached.
1940s; earliest use found in Proceedings of the Physical Society of London.
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