The tube in question is a special vacuum diode designed to be operated in saturation ... and covers most of the frequency bands of interest to radio amateurs. The whole project is built up ...

He found an assembled Philmore “selective” radio kit. The simple kit had a coil, a germanium diode, and a crystal earphone. We were sad when [Michael] accidentally burned a part of the radio ...

Teledyne HiRel Semiconductors has announced the availability of its Gallium Nitride (GaN) high-power RF switch, model ...