"It may seem like one, but it's really the same kind of circuit you find in a crystal set," Rick explained.
All their spectacles that I have seen were crystal set in horn, tortoise-shell, or ivory.
It is as easy to build a vacuum tube set as a crystal set and only a very little more expensive.
Clocker remembered the crystal set his father had bought when radio was still a toy.
In the centre of the cross is a crystal set in an oval mount.
He addressed Gus, who was laying out the hook-up for a crystal set.