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自1906年实用的电子管面世,1912年高真空管研制成功以来,就有了声频放大器(当时称低频放大器)。声频放大器最先应用于无线电收音机,随着唱片技术的发展,电唱机对大音量和高音质的要求,有声电影的实现,剧场对扩音设备急需革新,所以在20世纪30年代电子管声频放大器已进入全盛时期。基于电子管的改良,负反馈技术的成熟,二次大战后,慢转密纹唱片、调频广播的出现,更刺激了人们对高性能声频放大器的研究开发,一些高保真放
Since 1906 practical tube available, since the successful development of high vacuum tube in 1912, there is an audio amplifier (then known as low-frequency amplifier). Audio amplifier first used in radio radio, with the development of recording technology, record player for large volume and high quality requirements, the realization of audio and video theater, the sound reinforcement equipment in urgent need of innovation, so in the 1930s tube audio amplifier has entered Heyday Based on the improvement of the electron tube, the maturity of the negative feedback technology, the appearance of slow-tracked compact discs and FM radio after the Second World War, more stimulated the research and development of high-performance audio amplifiers. Some high-fidelity amplifiers