Most electronic tubes are vacuums.

多数电子管是真空的。

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The second generation of machines utilized improved miniature electronic tubes, and later solid-sate circuits.

第二代机器使用改良的微电子管和后固体电路。

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This paper mainly talks about the effect of hidden troubles with television transmitters on electronic tubes, and also comes up with some solutions according to the experience.

对电子管电视发射机几种隐性故障影响电子管寿命进行了探讨，并结合实践给出了解决问题的经验和方法。

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That means the electronic applications seem likely to go to boron nitride and other non-carbon tubes with similar properties.

ECONOMIST: Nanotechnology: Pipe dreams | The