Abstract :
A complete heat-balance is given for a unique tripod-supported cathode which is presently being used in special-purpose Image Orthicons, Vidicons, and other camera tubes. Design curves are given in terms of system parameters such as shape factors, conductivities, emissivities, heater-to-lead length ratios, and radiation-shield spacings. Typical data on cathode emission vs. heater-power input are given. Filament design curves are given in terms of surge current, wire diameter, wire length, operating temperature, voltage, and power, for pure tungsten, 3% and 20% rhenium tungsten.
