VT90 forced air-cooled triode
circa 1940
CV257 disc sealed triode, 500-1000 MHz (E1457)
1950
CV52 (E1231) indirectly heated glassUHF triode
circa 1941
Micropup CV55 air-cooled triode
circa 1940-1941
YL1550 Clansman transmitter, 300 watts, 100 MHz.
circa 1970
CV199, triode with forced air-cooled anode
circa 1940-1941
Electrometer triode, measured down to 10 amps,.
circa 1933
Catkin MS4B screened grid IF amplifier.
circa 1934
CV58 axial diode mixer valve
circa 1941