Wiktionary
electron tubes
n. (plural of electron tube English)
Usage examples of "electron tubes".
In August 1996, he was noted [in earlier GCHQ intercepts] supplying electron tubes and Boeing 707 and 747 aircraft spare parts to an Iranian company.
Three got through to destroy both the hippos of the first attacking wave and one of the electron tubes.
I'd rather be a mass of electron tubes than a thing like a centipede&mdash.
I'd rather be a mass of electron tubes than a thing like a centipede-oh yes, I've seen that cartoon in yesterday's Chicago Times!
As it was, he knew that transistors were semi-conductor devices able to take the place of many electron tubes.