A transformer-coupled class A amplifier is just what it says it is. You'll recall that a class A amp is one that has an output that varies through all 360 degrees of an input signal. As regards the manner in which the signal is coupled to or from the stage, a transformer is used, complete with the non-linearity that it will introduce because of the characteristics of the (untuned) inductive component.
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Class C amplifier.. A class D amplifier is more efficient than class B, and is more efficient than class C as well.
Class B operated amplifier is used extensively for audio amplifiers that require high power outputs. Its also used as the driver and power amplifier stages of transmitters.
"What is class AB push pull amplifier and give its circuit and description .?"
A: class a
hi i m nishikantanswer is: in class B devices are biased approx at cutoff.