随着新型磁带、磁头的发展以及降噪电路、先进控制技术的应用,对广泛使用的单主导轴录音机芯(走带机构)的性能和功能改进就显得刻不容缓。通常,盒式磁带在放音或录音时是沿一个方向运行的,如要使用另一面磁带,需用手翻面重装磁带盒。为了省去这个翻面的麻烦,1979年以来出现了一种具有自动反转功能的录音机,机中采用了双主导轴机芯,也称自动反转机芯。当磁带的一面走完后,机芯即使磁带反方向运行,以达到跟翻面同样的效果。这种双主导轴机芯的传动方式最初应用在高级录音座中。当时,为了提高单主导轴机芯的录放效果,除了把电路作了改进以外,还把录放两用磁头换成了录放组合磁头。组合磁头的磁路及缝隙宽度按录音和放音的需要分别设计,以充分发挥其各自的特性。同时,在录音时还能监听录制效果,也可扩展边录边能微调偏流的功能,实现理想化录音。可是在盒式录音机芯 With the development of new tapes, heads, and noise reduction circuits and advanced control technology, it is imperative to improve the performance and functionality of the widely used single capstan recorder (deck). Normally, the tape cassette runs in one direction during playback or recording. To use the other tape, reload the cassette by hand. In order to save the trouble of turning over, a tape recorder with auto-reversing function appeared since 1979. The machine adopts a double capstan movement, also called auto-reversing movement. When one side of the tape is gone, the movement runs even in the opposite direction of the tape to achieve the same effect as the flip. The drive of this dual-capped shaft movement was originally used in high-end recording stands. At that time, in order to improve the recording and playback of a single-capped spindle movement, in addition to making improvements to the circuit, the dual head for recording and reproducing was replaced with a recording and reproducing combo head. Magnetic head and the combination of the magnetic circuit width and width of the recording and playback needs were designed to give full play to their respective characteristics. At the same time, the recording can monitor the recording effect, but also can be expanded to record side edge trimming bias function, to achieve idealized recording. But in the cassette recorder core