Perhaps nothing added quite so much to the charm of vacuum tube circuits from back in the heyday of the vacuum tube as did the “Magic Eye” indicating tube. With the ghostly green glow of its circular ...

We’re used to low cost parts and a diversity of electronic functions to choose from in our projects, to the extent that our antecedents would be green with envy. Back when tubes were king, electronics ...

A plastic 6-pin base with domed envelope. Donor’s card reads: “Electron-ray tube, glass type, made by the Radio Corporation of America in the early 1930s. An early model of the “magic eye” tuning ...