Ninety years ago this month, the November 1926 issue of Popular Science showed how to assemble this crystal set for the radio beginner, and offered a number of possible variations depending on the listener’s location and available stations.

The article noted that millions of Americans lived within five miles of powerful stations, but a surprisingly large number had not yet taken an interest in radio. But this simple receiver was billed as a mighty good way to get started, and predicted that many builders would eventually decide to upgrade and build a vacuum tube set. Parts selection kept in mind that many of the components, such as the variable condenser, could be used in the new set.

The author remarked that he had a friend who had a good five-tube set, but kept the old crystal set around for times when he wanted to listen to the radio alone. The headphones masked outside sounds, and he didn’t have to worry about wear and tear on his tubes.

The article suggested modifications of the antenna coil depending on the location and number of stations. It gave instructions on tuning. While moving the dial, you would adjust the crystal for the first hint of sound. When that was found, you would tune the dial for maximum sound, and then adjust the crystal for maximum volume. The crystal position could usually stay put for weeks. To prevent vibrations, the author suggested placing the set on a piece of cloth.