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4. Complete the sentences using while. Follow the model on page 13:

1. An amplifier is used to increase the value of the input voltage … .

2. When maximum grid voltage is produced in one tube … .

3. Direct current plate components are eliminated … .

5. Answer the following questions:

1. What is an amplifier used for?

2. By what means is a greater output voltage produced?

3. What are the main parts of a push-pull amplifier?

4. In what way are the tubes and the transformer connected?

5. Why does die sum of the plate currents remain constant?

6. Where are the plate currents fed?

7. What type of current is amplified by a push-pull amplifier?

8. What is the difference between a rectifier and an amplifier?

6. Say a few words about an amplifier and a rectifier. What do they have in common? What is the main difference between them? Unit Twenty-One [21]

1. A) Cover the right column and read the English words. Translate them into Russian and check your translation.

b) Cover the left column and translate the Russian words back into English.

bias

[ˈbaɪəs]

дополнительное (смещающее) напряжение

stage

каскад, ступень

to follow

[ˈfɔlou]

следовать (за)

stage of amplification

ступень (каскад) усиления

grid bias

напряжение смещения

grid bias battery

сеточная батарея

grid plate capacitance

емкость анодной сетки

2. Put down the Russian for:

the main parts of the device

___________________________

the following change of voltage

___________________________

the main components of the plate voltage

___________________________

the following stage

___________________________

plate voltage supply

___________________________

grid bias

___________________________

voltage variations

___________________________

Amplifier Stages in Series

Amplifiers in use nowadays contain several stages. Sometimes their number is very great. Let us consider an amplifier including three stages. Its circuit uses three triodes connected in series. The circuit has a resistance as the plate load. A common plate voltage supply and a common grid bias are employed. The grid of each tube is insulated from the direct current component of the plate voltage by means of a capacitor. When the amplifier operates the voltage operation of the load of one tube is applied to the grid of the next tube. The voltage variation is transferred to the grid of the following tube through a capacitor.

Fig. 17

A change of voltage on the first grid circuit results in an amplified plate current in the third stage.

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