Excited by the current, the mercury atoms emit ultraviolet light, which bombards the phosphor coating on the inside of the tube.
被电流激活后，汞原子发出紫外光，轰击被覆在电子管内部的磷。
Others try to recreate a particular sound belonging to a piece of equipment that is old or no longer current, such as the sound created by tube amplifiers.
还有些发烧友则想要重现一些老旧或者不再时兴的设备独特的声音，比如电子管功放发出的声响。
Applications such as measuring light with a photomultiplier tube generally require the use of a picoammeter due to the low current levels involved.
由于要测量的电流非常弱，所以用光电倍增管测量光的应用工作通常需要使用皮安计。
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