d -- para 46a
A change of 30 volts in plate voltage results in the same change
in plate current as a 0.5-volt change in grid voltage. The ratio of
these small changes in voltage is
d -- para 48b
The dc resistance is determined by applying Ohm's Law, where the
numerator is the steady voltage at the plate, eb 210 volts, and the
denominator is the corresponding steady plate current, Ib = 7.0 mA.
c -- para 48c; Attached Memorandum, fig.
The construction on the plate characteristics of figure 3-4
shows that near point Q a 3.5-mA change in plate current is
associated with a 40 volt total change in plate voltage:
b -- para 52c(2)
This problem can be solved in two different ways.
(1) The sum of the voltage drops around the circuit must be
Ebb = eb + IbRL
IbRL = Ebb - eb = 300 - 210 = 90 volts.
(2) It is known that the steady value of plate current, Ib, is
Thus the voltage drop across the resistor, IbRL
IbRL = (7.0 mA)(12,860 ohms) = 90 volts.
a -- para 51e(2)
d -- para 52c(1)