The typical analysis of a class B power amplifier utilizes a load that is purely resistive. A real world load, such as a loudspeaker, is reactive, and can have a phase angle that varies with frequency. This can affect the load line in a surprising manner. For this video, the load impedance is scaled to a larger value compared to a typical loudspeaker, making it possible for you to build and test this circuit in lab without having to deal with a large powers and currents, or the noise of a loudspeaker.
References: Semiconductor Devices: Theory and Application/2E; Chapter 8, section 4; and Chapter 9, section 2.
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27 фев 2024