Quizzes for review
The vintage radio's warm, crackling sound came from a single thermionic valve glowing softly in its chassis.
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The vintage radio's warm, crackling sound came from a single thermionic valve glowing softly in its chassis.
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Related words
thermionic valve
Noun
historical
Japanese Meaning
真空管：発光する陰極から放出された電子を内部の真空状態のガラス管内で利用し、スイッチや増幅などの電気的機能を果たす電子部品（主に歴史的な用語）
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