The various factors that may cause a current to flow to the control grid of a high vacuum tube are outlined. The magnitudes of the separate components are experimentally determined, and methods are given by which these currents may be greatly reduced. A tube is described which has a grid current of 10^-15 ampere and a mutual conductance of 25 microamperes per volt. As an input resistance of 4×{}10¹¹ ohms may be used, a current of 10^-17 ampere may be detected when a galvanometer having a sensitivity of 10^-10 ampere per millimeter is used in the plate circuit. Under this condition the sensitivity is 250,000 millimeters per volt.
No takes yet. Share an insight, caveat, or question.
Metcalf et al. (1930) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: