De Forest triode type 480, 1927
1927
Water Cooled Triode
Mullard type QY3-125 all glass TX triode (VTT)
1940-1960
Disc-seal triode type GL446A
Philips triode, type 328, c.1925
1925
Miniature triode on miniature four-pin base
Forced - air - cooled industrial triode
Federal type 15E VHF triode as used in CXAM radar (VTT)
1940-1960
Mullard type TD04-20 disc seal triode (VTT)
1940-1960
Triode, ST & C type M4205E
Radiation-cooled triode
1963
G.E.T. 1 Germanium Triode, by G.E.C. c.1953
1953
Gema V.H.F. triode, type TS1a
Triode, type NT 19
Short wave transmitting triode
Disc-seal triode (unnumbered)
V.H.F. triode, type TS/60/14
Cunningham triode type C300 1921
1921
U.H.F. triode type VT90
Cunningham triode type C301
1921
German KTD triode
1914-1918
Cosmos SP 18 Blue Spot short-path triode
1926
Mullard one-volt ORA triode, marked LF83
Ken-Rad V.H.F. triode, type 826
V.H.F. triode, type NR88
Telefunken triode type EVN 7171
1917
Acorn triode, type 955
Cryselco triode
Mullard type TD03-10 disc seal triode (VTT)
1940-1960
Triode, type U4E8
Mullard triode with inclined electrode assembly
Disc Sealed Triode (VTT)
1947
Mullard NT13 triode
De Forest triode type 427, 1927
1927
Cunningham triode type C301A
1923
VT 98A air-cooled power triode
1939-1945
Cunningham triode type CX300A
1926
High powered triode
Arcturus triode type 126, c.1929
1929
Dutch 4 volt bright emitter triode
Dutch 2-volt bright emitter triode
Mazda PP3/250 15-watt triode, 4V heater and box
Disc-seal triode resembling CV 53 or CV 82
G.E.C. type CAT30 Water Cooled Triode
1955-1970
Mullard DA32 triode
G.E.C. type CAT100 Water Cooled Triode
1955-1970
triode EW 51
circa 1950