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