The relative merits of planar and cylindrical triode geometries are discussed. together with the heat dissipation problem and. required cathode area.nThe salient features of both a planar and a cylindrical electrode tube design are presented. The functional purpose is stated for various parts and. assemblies.nData relating tube temperature dependence upon plate power input and saturated plate current dependence upon temperature were obtained from a prototype triode with basket type wire mesh. grid The basket grid proved undesirable because of grid deformation tendencies.nPlanar power triodes with parallel wire grids were constructed which had plate family characteristics very near the objective. Obtaining a high level of cathode emission continues to be a problem.
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