The problem of the amplification of minute photoelectric currents by means of standard radio apparatus is discussed and a common reason for failure to obtain high sensitivity with ordinary tubes is pointed out. A radio receiving tube is described and its input resistance is raised from 108 to 1013 ohms by means of special use of its grids together with greatly reduced operating voltages. It is shown that this value of input resistance is higher than necessary for ordinary measurements made with the various electrometer type tubes. A comparison curve, showing the region of applicability for three tube types, is included.
No takes yet. Share an insight, caveat, or question.
Gabus et al. (1937) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: