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
U.H.F. triode type VT90
Short wave transmitting triode
Telefunken triode type EVN 7171
1917
Cunningham triode type C301A
1923
Cosmos SP 18 Blue Spot short-path triode
1926
Radiation-cooled triode
1963
Mullard triode with inclined electrode assembly
De Forest triode type 427, 1927
1927
V.H.F. triode, type TS/60/14
Miniature triode with flying leads
German KTD triode
1914-1918
Mullard one-volt ORA triode, marked LF83
Ken-Rad V.H.F. triode, type 826
Miniature triode on miniature four-pin base
Federal type 15E VHF triode as used in CXAM radar (VTT)
1940-1960
Mullard type TD04-20 disc seal triode (VTT)
1940-1960
Water Cooled Triode
Disc-seal triode (unnumbered)
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
Cryselco triode
Disc Sealed Triode (VTT)
1947
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
High powered triode
Cunningham triode type CX300A
1926
triode EW 51
circa 1950
G.E.C. type CAT100 Water Cooled Triode
1955-1970
Mullard DA32 triode
Disc-seal triode resembling CV 53 or CV 82
Arcturus triode type 126, c.1929
1929
Dutch 4 volt bright emitter triode
G.E.C. type CAT30 Water Cooled Triode
1955-1970