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珠海斯巴克电子有限公司推出的Cayin A-300P和A- 200P就像是一对孪生兄弟,无论从前后左右哪个方面来看,二者几乎都是一模一样。多数人必须要以功放面板上的印字来进行区分,而资深胆机爱好者或许可以从功率放大管外形上的细微区别来加以判断：使用300B的是A-300P,而使用2A3C的则是本文的主角A-200P。
The Cayin A-300P and the A-200P, introduced by Zhuhai Spark Electronics Co., Ltd., are like two twin brothers, both of which are almost identical in terms of front, rear, left and right. Most people have to distinguish between the printed on the power amplifier panel, and senior enthusiasts may be able to judge from the subtle differences in the shape of the power amplifier tube: the use of 300B is A-300P, and the use of 2A3C is this article The protagonist A-200P.