circuit pairs each rf pre correction circuit 56 is set or adjusted to compensate for distortion caused by its associated high powered amplifier circuit 52 thus the rf pre correction circuit 56a is set adjusted for distortion caused by the high powered amplifier circuit 52a the result of such an arrangement is a uniformity among the plurality of high powered amplifier circuits and lower intermodulation products result at the output 54 an example of components of the high power amplifier circuits 52 that are associated with distortion are shown in fig3 such distortion causing components are in addition to the actual amplifying device 60 specifically each high power amplifier circuit 52 includes linear distortion causing component s 62 typically the components 62 include input matching components circuits typically the matching components circuits consist of a matching network for a solid state device or input cavities for a tube type device the linear distortion caused by the components 62 include frequency response errors and phase errors from an ideal amplifier straight line transfer characteristic the actual amplifying device 60 has a non linear distortion effect this is true whether the amplifying device 60 is solid state type or tube type the non linear distortion is due to its mode of operation i e class a a b etc and its saturation characteristics post amplification components 64 of the high power amplifier circuit 52 also cause linear distortion the components 64 comprise the high power amplifier circuitry output network turning now to the rf pre correction circuit 56 each circuit 56 consists of a non linear am to pm pre correction circuit 66 a non linear.