Mass of Electron Apparatus

Many years ago in the early days of Radio, the “Magic Eye Tube” was a popular and very effective method of indicating that the radio station was properly tuned in. The ‘fan shaped’ illumination became narrower as the tuning improved and the tuning knob was adjusted to get the narrowest ‘fan’. This same tube is used today, not for radio, but for viewing the path of an electron beam. One of these special tubes is mounted on a plastic base fitted with a valve socket and with terminals for connection to a power source. When the tube's heater and anode are connected to a suitable power source, the electron beam flows from the centre to the outside across a fluorescent surface that glows green where the electrons are passing. The shape of the glow is ‘fan’ shaped and it is formed from the central cathode to the circular anode surrounding it.

Instruction Sheet