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A new class of high-efficiency amplification is introduced. It based on the reduction of time-average dissipation in transistor power instead of state-of-the-art reduction of instantaneous dissipated power. This becomes possible due the influence of capacitance currents that produce a negative collector current swing during a part of AC-period. In this case, along with an always-positive collector-emitter voltage, the instant dissipated power also is negative. A high-efficiency BJT power amplifier was simulated in order to demonstrate the new class features.