vacuum-tube

This glow is conceived to represent the Aurora, which may consequently be likened to a gigantic exhibition of vacuum-tube lights.

It was only a matter, he said, of transferring a man's habit patterns from brain cells to vacuum-tube cells.

Radiofrequency power is supplied to the dee by a vacuum-tube oscillator.

He guessed that they were housings for vacuum-tube elevator shafts that led to underground caves.