An electronic vacuum tube containing two triodes in a single glass envelope.
From duo- (Latin 'two') + triode (from tri- 'three' + -ode from Greek hodos 'path'). The term arose in early 20th-century electronics.
A duotriode was the musician's friend—guitar amplifiers used these tubes, and a single duotriode could handle both preamp and driver stages, which is why vintage amp collectors still obsess over tubes like the 12AX7 duotriode.
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