VFDs — vacuum fluorescent displays — have a distinctive ... The glass display is evacuated and, like a tube, has a getter to consume the last of the gas. There’s a filament that emits ...

The video explains the operation of the vacuum tube, specifically the triode, which is essential in modern communication devices like radios and telephones. It describes how a tungsten filament emits ...

The film discusses the crucial role of vacuum tubes in radio broadcasting, detailing the various jobs involved in the industry, from production and scriptwriting to technical maintenance and ...