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