However, NEC has developed a new harmonically tunedamplifier which achieves 45% efficiency on otherwise standard components.
但是NEC已经开发出了一种新的谐波调谐放大器，可以从其它方面使这些标准设备的效能增强45%。
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As the amplifiertuned load circuit, they are able to select the base component cosine pulse to obtain undistorted amplification signal output, so this amp is also known as tuned power amplifier.