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现代优质密纹唱片具有很高的电声指标,是目前除CD 唱片以外保真度最高的节目源。此外,唱片性能稳定,易于长期保存,唱机使用维护简单,便于直观快速选曲,而它们的售价相对较为低廉。因此,唱片放音是现代家庭实现高保真放音最为理想的方式。为了忠实地重现唱片所载的原始信息,除了要有优质唱机外,还要求有失真低、动态大、噪声小和补偿性能良好的优质均衡放大器。目前普遍采用的两级式均衡电路(图1)或再加一级射随的三级式电路已不能满足高保真放音的要求。
Modern high quality compact discs with high electroacoustic index, is the highest fidelity program source except CD record. In addition, the record performance is stable, easy to long-term preservation, record player easy to use and maintain, easy to visual and fast selections, and their relatively low price. Therefore, the record sound playback is the most ideal way for modern families to achieve high-fidelity playback. In order to faithfully reproduce the original information contained in the record, in addition to have a good record player, but also requires low distortion, dynamic, small noise and good compensation performance balanced amplifier. Currently widely used two-stage balanced circuit (Figure 1) or plus a radio with the three-stage circuit has been unable to meet the requirements of high fidelity playback.