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английский) 1:
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Amplifier Stages in SeriesAmplifiers 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 load plate. A common plate voltage supply and a common grid bias are self-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 co-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.
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