A radio frequency (RF) amplifier system uses an envelope elimination and restoration (EER) amplifier having at least one carrier input, at least one power input, and at least one amplifier output carrying an amplified signal. The RF amplifier system disclosed also uses a diplexer receiving the amplified signal and filtering the amplified signal, the diplexer having at least one RF output and at least one harmonic energy output. Further, the RF amplifier system uses a harmonic energy recovery circuit. The harmonic energy recovery circuit is coupled to the at least one harmonic energy output and the harmonic energy recovery circuit having at least one output coupled to the EER amplifier.