De Forest triode type 480, 1927
1927
V.H.F. triode, type TS/60/14
U.H.F. triode type VT90
Disc-seal triode type GL446A
Miniature triode with flying leads
Miniature triode on miniature four-pin base
Mullard one-volt ORA triode, marked LF83
Cunningham triode type C300 1921
1921
Disc-seal triode (unnumbered)
Ken-Rad V.H.F. triode, type 826
Cosmos SP 18 Blue Spot short-path triode
1926
Triode, ST & C type M4205E
German KTD triode
1914-1918
Philips triode, type 328, c.1925
1925
Gema V.H.F. triode, type TS1a
Cunningham triode type C301
1921
Radiation-cooled triode
1963
G.E.T. 1 Germanium Triode, by G.E.C. c.1953
1953
Triode, type NT 19
Forced - air - cooled industrial triode
Mullard type QY3-125 all glass TX triode (VTT)
1940-1960
Federal type 15E VHF triode as used in CXAM radar (VTT)
1940-1960
Mullard type TD04-20 disc seal triode (VTT)
1940-1960
Mullard triode with inclined electrode assembly
Mullard NT13 triode
Cryselco triode
Telefunken triode type EVN 7171
1917
Triode, type U4E8
Acorn triode, type 955
Disc Sealed Triode (VTT)
1947
De Forest triode type 427, 1927
1927
Cunningham triode type C301A
1923
V.H.F. triode, type NR88
Mullard type TD03-10 disc seal triode (VTT)
1940-1960
VT 98A air-cooled power triode
1939-1945
Dutch 2-volt bright emitter triode
Dutch 4 volt bright emitter triode
Arcturus triode type 126, c.1929
1929
Cunningham triode type CX300A
1926
Water Cooled Triode
High powered triode
Disc-seal triode resembling CV 53 or CV 82
Mullard DA32 triode
G.E.C. type CAT100 Water Cooled Triode
1955-1970
G.E.C. type CAT30 Water Cooled Triode
1955-1970
triode EW 51
circa 1950