Notes on the use of screen-to-plate transconductance in multigrid tube circuit design

THE conductance contour technique1 of circuit design provides a direct and rapid means of co-ordinated static and dynamic design of electronic circuits. It yields results in a form which enables the designer to tell by inspection whether the design will comply with design requirements or is marginal or unsuitable. Design rules based on the conductance technique enable the user to test alternate tubes for the tubes having unsatisfactory characteristics. However, the rules do not make it possible to reconsider the problem and directly select two or three tubes offering the best opportunity for achieving the desired design.