A method, device and system is disclosed for high efficiency power amplification of a signal over a broad range of output power. Two broad-banded, parallel-tuned class E power amplifiers are combined through a lossless half wave transmission line combiner and configured to operate in an outphased arrangement to permit amplitude modulation. Asymmetrical shunt tuned switches are tuned for efficient amplitude modulation while asymmetrical drain inductors provide enhanced efficiency at outphased conditions over that of a symmetrical circuit. The drain source inductors and transmission components are tuned for maximum efficiency at full power output and for minimum dissipation a zero power output. At zero degrees outphasing, the circuit operates as a conventional Class-E power amplifier. However, at 180 degrees outphasing, each quarterwave line in the combiner reflects back all incident power, permitting the circuit to operate as an unloaded resonant switching circuit.