Four-Electrode Valve

Valve

Fleming Four-electrode valve. British patent 149, 422, 12 May 1919. (see also Fleming "Thermionic Valve). 2 pairs of anodes (nickel) arranged symetrically around filament. Used as a detector.

Marconi Osram

Electronic and Electrical Engineering

LDUSC-EE-159

158

UCL Science and Engineering Collections