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  • Plate resistance of two triode valves is  and <img alt="\mathrm{4k\Omega}" src="h

Plate resistance of two triode valves is \mathrm{2k\Omega} and \mathrm{4k\Omega}, amplification factor of each of the valves is \mathrm{40}. The ratio of voltage amplification, when used with \mathrm{4k\Omega} load resistance, will be
 

Option: 1

10


Option: 2

4/3


Option: 3

3/4


Option: 4

16/3


Answers (1)

best_answer

Voltage amplification \mathrm{A_v=\frac{\mu}{1+\frac{r_p}{R_L}}=\frac{\mu R_L}{R_L+r_p}}

\mathrm{\Rightarrow \frac{A_1}{A_2}=\frac{4+4}{2+4}=\frac{4}{3}}

Hence option 2 is correct.

Posted by

Deependra Verma

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