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増幅器

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De Forest, some time between 1914 and 1922, with two of his Audions, a small 1-watt receiving tube (left), and a later 250-watt transmitting power tube (right), which he called an "oscillion".

リー・デフォレスト電子時代の扉を開いた真空管の先駆者

リー・デフォレスト真空管オーディオン三極管
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