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If, in the voltage amplifiers, there is nearly no current
passing from one stage to the other, in the power stage, the
current becomes important.
The majority of the tubes have an output impedance higher than the loudspeakers one, a transformer to adapt (=lower) this impedance is necessary. It allows also to stop the DC which would be fatal to the loudspeaker, the DC generates only heat and no noise at all ...
The plate resistance is replaced by the output transformer primary. The secondary is connected to the loudspeaker.
How DC and AC currents flow in a power stage.