4.1 Output stage, or power stage, of a vacuum tube amplifier

The task of the output stage (or power stage) is to amplify the signal, produced by the preceding stage, to have the necessary power to obtain sound from a speaker. We will consider a power amplifier in Push-Pull configuration, where a pair of vacuum tubes are used simultaneously to amplify phase inverted copies of the same signal. However, before discussing it, we first need to introduce the Single Ended configuration, where a single vacuum tube is used to amplify the signal. The push-pull configuration is then obtained by appropriately pairing two single ended power amplifiers.

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