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收录机和录音座经过长时间使用以后,其中录放磁头的弧面会被磁带磨损,造成放音和录音后音量明显变轻甚至录不进音.从磁头外表看,机械磨损最厉害的部位是磁头弧面的中央缝隙部分.从磁头内部来讲,正是叠片铁芯的“嘴深”即缝隙的深度被磨浅甚至被磨穿了. 造成放音变轻的原因是,磁头放音输出电压同磁带与磁头之间的距离以及信号的波长成指数关系.新磁头的弧面经抛光处理后的表面不平度一般小于2微米.磁头在工作了几十小时以后,磁粉和尘埃会沾污
After a long period of use of the tape recorder and the recording base, the arc surface of the recording and reproducing head will be worn by the tape, which causes the volume of the recording and reproducing head to be obviously reduced or even not recorded after the recording and playing of the recording head. The central part of the surface of the gap.From the inside of the head, it is the laminated core “mouth depth” that is the depth of the gap was abradable or even worn through .Because the playback sound is lighter, head playback output voltage The distance between the magnetic tape and the head and the wavelength of the signal exponential relationship between the surface of the new head after the arc polished surface roughness is generally less than 2 microns.During the work of the magnetic head for dozens of hours after the magnetic powder and dust will be stained