(Solved): (b) A pentode amplifier is shown in Figure 2. Clearly explain why it is necessary to connect G3 to t ...

(b) A pentode amplifier is shown in Figure 2. Clearly explain why it is necessary to connect G3 to to the cathode and G2 connected

instead of

. What is the overall effect of of the extra grids on the circuit? Given that the plate resistance is

, is

and a current a current of

flows through the plate

tube and

flows through

with no input signal. When a 4 Volts peak to peak Sinusoidal signal is applied to its input the plate current changes to current changes to

for a positive peak and

for a negative peak. Find the peak-to-peak output voltage, the voltage gain of the pentode given

and

. Also evaluate the quiescent plate voltage given

. [6marks]