11. When a pentode is used with a high load resistance, the transfer
characteristic develops a sharp "knee." This can be a disadvantage,
because when such curvature in the transfer characteristic is near
the operating point, it indicates the presence of
abnormally high transconductance.
secondary emission effects.
12. A comparison of the two methods of aligning the screen and
control grids (fig. 82 of TM 11-662) shows that method B allows more
electrons to reach the plate.
Another advantage gained by aligning
the grids by using method B is
an increase in screen current.
a reduction in plate resistance.
a reduction in the effects of secondary emission.
13. Consider the effect of the plate voltage, the screen voltage,
the control grid bias, and the plate load resistance on a pentode's
transconductance rating. Which of these four can be changed without
affecting the transconductance?
The plate voltage
The plate load resistance