The diagram illustrates a typical characteristic AEC, of the new multi-[?]u valves. It will be seen that there is a long and fairly straight portion AE in which the mutual conductance decreases toward A. To operate on this portion a high grid bias of about 30 volts is required. The short deep portion EC is a relatively high slope or mutual conductance, and to operate along this portion a small grid bias of approximately 3 volts is required. If an orthodox double characteristic is obtained by combining the electrodes of a high new valve BD, with the slope of a low new valve AC, the general characteristic is then AEC.

Radio Record, Volume V, Issue 2, 24 July 1931, Page 6

The diagram illustrates a typical characteristic AEC, of the new multi-[?]u valves. It will be seen that there is a long and fairly straight portion AE in which the mutual conductance decreases toward A. To operate on this portion a high grid bias of about 30 volts is required. The short deep portion EC is a relatively high slope or mutual conductance, and to operate along this portion a small grid bias of approximately 3 volts is required. If an

orthodox double characteristic is obtained by combining the electrodes of a high new valve BD, with the slope of a low new valve AC, the general characteristic is then AEC.