Before that, for nearly four decades, the key component for all radio, television, telephone and computer systems was an audion, a triode invented by Lee de Forest in 1906. Born in Iowa ...

The regenerative radio is long-ago superseded in commercial receivers, but it remains a common project for electronics or ...

Invented and patented by Korg, the Nutube, according to its maker, is “similar to a conventional vacuum tube, has an anode ...

Ideally, if you are going to transmit, you want a properly-tuned resonant antenna. But, sometimes, it isn’t practical. [Ham Radio Rookie] knew about random wire antennas but didn’t want a wire ...