Catkin MS4B screened grid IF amplifier.

circa 1934

CV52 (E1231) indirectly heated glassUHF triode

circa 1941

Electrometer triode, measured down to 10 amps,.

circa 1933

CV257 disc sealed triode, 500-1000 MHz (E1457)

1950

VT90 forced air-cooled triode

circa 1940

CV58 axial diode mixer valve

circa 1941

YL1550 Clansman transmitter, 300 watts, 100 MHz.

circa 1970

Micropup CV55 air-cooled triode

circa 1940-1941

CV199, triode with forced air-cooled anode

circa 1940-1941