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新购进的LY637型录音机没有带前临听,使用起来不方便。为了解决这个问题,我们把放大器盒上的两刀四掷(4WZD)波段开关更换为三刀四掷(4W3D)波段开关,对线路进行了稍微的改动(改动线路见附
Newly purchased LY637 tape recorder without front, easy to use. In order to solve this problem, we changed the 4WZD band switch on the amplifier box to the 3WD 4W3D band switch and slightly changed the circuit