The amplifier including input controlled and switching self-oscillating stage with their output combined acting as the output rail for better accuracy and efficiency now incorporates H.F. self-oscillating stage connected between the inverting output of the controlled stage and the input of the switching self-oscillating stage. The inverting output of the H.F. self-oscillating stage is connected to the output of the amplifier. A coupling element is connected between the H.F. output of the switching self-oscillating stage and sync. input of the H.F. self-oscillating stage.
