New Mechanism for the Generation of Flicker Noise in Tubes with Oxide-Coated Cathodes

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Abstract
Evidence is presented which seems to indicate that a major part of the flicker noise in tubes with oxide‐coated cathodes is generated in a thin surface layer of the coating. The effect is shown to be caused by the fact that a dc voltage drop and a noise voltage fluctuation are generated in the surface layer. In tubes with a porous cathode coating this noise voltage modulates the current coming out of the surface pores, thus leading to a true fluctuation in the current. In tubes with a nonporous cathode coating this noise voltage modulates the emission current, thus leading to a true fluctuation in the emission.