1957 年 26 巻 2 号 p. 63-67
D.C. stability of self-biased flip-flop circuit has been studied. The self-biasing is preferable for the benefit of good stability against the changes of power voltage. There are some commendable D.C. designs for fixed biasing but optimum bias design has not been worked out. This report gives the optimum bias value (Eq. 10) with the optimum dividing ratio of grid resistance (Eqs. 14_??_17), enabling to secure the best working condition for every type of tubes. An example of the design, a stability test and the result of over one year's continuous operation are also given. Permissible minimum plate load is discussed considering the stability conditions and maximum plate dissipation of several types of tubes. This design system has proved to be very useful.