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Stages in the Series Amplifier
Amplifiers in use nowadays the 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.
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