Vacuum tubes

A vacuum tube is based on current conduction through a vacuum (see Vacuum tube).

Diode or rectifier tube

Amplifying tubes

Triode

Tetrode

Pentode

Hexode

Pentagrid

Octode

Microwave tubes

Klystron

Magnetron

Traveling-wave tube

Optical detectors or emitters

Phototube or Photodiode – tube equivalent of semiconductor photodiode

Photomultiplier tube – Phototube with internal gain

Cathode ray tube (CRT) or television picture tube

Vacuum fluorescent display (VFD) – Modern non-raster sort of small CRT display

Magic eye tube – Small CRT display used as a tuning meter (obsolete)

X-ray tube – Produces x-rays

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