Operating Characteristics of the FP54 Thermionic Directhyphen;Current Amplifying Tube

摘要

The most suitable characteristics for steady deflection and electrometer use are discussed separately. For the former case it is shown that the mutual conductance may be increased three times the recognized value. When the tube is used as an electrometer a grid current as low as 10minus;17ampere may be obtained with a voltage sensitivity of 10minus;4volt/division. The capacity of the grid system being only 3times;10minus;12farad a highly satisfactory electrometer results.