太阳光能量通过玻璃真空管采集，由金属超导热管传热至承压水箱内把水加热。
Sunlight energy is collected by glass vacuum tube and metal superconductive tube transmits heat to the pressure-bearing water tank to heat up water.
重金属吉他手使用真空管放大器造成严重失音。
Heavy metal guitar players use vacuum tube amplifiers to produce extreme distortion.
在那个时候唯一可靠的真空管就是Western Electric 中继器三极管，而如果需要变阻器时，就用金属丝缠在木卷轴上自己做一个。
In those days the only reliable vacuum tube was the Western Electric repeater triode, and if one needed a variable resistance he wound a lot of wire on a wooden spool.
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