All Types

By Electrode

Diode

Triode

Tetrode

SG (Screen Grid) or RF Tetrode

Beam Tetrode

Pentode

Hexode

Heptode / Pentagrid converter

Octode

Triode-Pentode

Triode-Hexode

Nonode

Indicators & Displays

Vacuum Types

CRT

Magic Eye

VFD Annunciator / Indicator

VFD seven segment

VFD matrix panels

Gas Filled

Neon

Xenon

Planaplex

Nixie

Plasma panel

CFL

CCFL

Florescent tube

Mixers, Converters, Modulators

Pentode (using g2 or g3 as L.O. input)

Hexode

Heptode / Pentagrid converter

Octode

Triode-Pentode

Triode-Hexode

Nonode

Beam Switching tube

Triode or Pentode as self oscillating mixer (usually VHF & UHF)

Counters

Dekatron, Decatron (gas filled)

Trochotron (Vacuum tube)

Oscillators

Thyratron

Tetrode

Dynatron

Pliodynatron

UHF & Microwave

Klystron

Magnetron

Travelling Wave Tube (TWT  or Twit)

Carcinotron or Back Wave Tube

Photonics

photo-Diode

Photomultiplier

Orthicon, plumbicon, vidicon, saticon etc CRT based camera tubes.

Regulators

Barretter (Iron wire in Hydrogen)

Voltage Stabiliser (neon and other gasses)

Miniature

Acorn

B7G or all glass miniature

Subminiature

Rod Pentode

Pencil Tube

Nuvistor

Rarely used

Bi-Grid

Wunderlich

Gammatron