As a boy, he became fascinated with radios and built early crystal sets.

Radio quickly takes off with the British public in this decade, as listeners cluster around their crystal sets.

The idea is to keep everything fairly simple and let the young people actually make a useful piece of equipment, e.g. a crystal set.

"I got a rocket ship or something on my crystal set; I wanted him to hear it."

Sitting at the table playing poker with us, Bill Black saw the crystal set and did not remember.

The first wireless of any kind was a crystal set which my brother made.

There wasn't just time to build a crystal set; we could have built a radio tower.

Those with crystal sets could hear the programs that were broadcast at that time only on Saturdays from 2 until 4.

He'd told Mike that as a boy he had made a crystal wireless set.

In the early Twenties he had gone into business as a manufacturer of crystal sets and transformers.