CRTC Electronics

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Then the gain of an amplifier can be said to be the relationship that exists between the signal measured at the output with the signal measured at the input.


  • Class A   -   has low efficiency of less than 40% but good signal reproduction and linearity.
  • Class B   -   is twice as efficient as class A amplifiers with a maximum theoretical efficiency of about 70% because the amplifying device only conducts (and uses power) for half of the input signal.
  • Class AB   -   has an efficiency rating between that of Class A and Class B but poorer signal reproduction than class A amplifiers.
  • Class C   -   is the most efficient amplifier class as only a very small portion of the input signal is amplified therefore the output signal bears very little resemblance to the input signal. Class C amplifiers have the worst signal reproduction.


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