tube , ***
vacuum tube
thermionic vacuum tube
thermionic tube
electron tube
thermionic valve

They probably had vacuum tubes in them, really old technology.

"They probably have more vacuum tubes than any agency in the world."

This, in turn, led to the development of the vacuum tube.

Because the computer was built out of vacuum tubes, it often broke.

The standard textbook on the subject of vacuum tubes for more than 20 years.

In the 1920s, the company started to manufacture other products, such as vacuum tubes.

The vacuum tube became the de facto standard by 1936.

He noted that a single computer chip could do more work than 3.5 million vacuum tubes.

These can be generated with electric current and a vacuum tube.

Along the way he got a syringe and some vacuum tubes.