Because of their inherent distortion class C amplifiers are never used as audio amplifiers, but they are primarily employed in the final stage of TV transmitters. Also, owing to low efficiency of class A operations, these amplifiers are not employed where large RF (radio frequency) power is involved e.g., to excite transmitting antenna. In such cases class C amplifiers are used, since a class C amplifier has a very high efficiency, it can deliver more load power. In out put stage of a TV transmitter grid modulated class C amplifier is used.