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故障现象:开始工作正常,15分钟左右后出现音轻现象。分析与检修:机器正常工作15分钟之后声音变小,故怀疑该机的电压放大级、混合级、推动及功放级有热稳定性不良的元件存在。该机分别由6N1、6N2担任电压放大和混合,6P14担任推动,两只FU—7担任功放。首先对以上各级工作点进行检测,发现6N1、6N2、6P14、FU—7等各管在有、无故障时工作点都正常,这说明以上各管没问题。于是,重点怀疑交流回路,
Symptoms: Start working properly, after about 15 minutes light tone phenomenon. Analysis and Maintenance: After 15 minutes of normal operation, the sound becomes smaller. Therefore, it is suspected that the voltage amplification stage, the mixing stage, the promotion stage and the amplifier stage of the machine have the components with poor thermal stability. The aircraft were 6N1, 6N2 as the voltage amplification and mixing, 6P14 as a promotion, two FU-7 as the amplifier. First of all above work at all levels were detected and found 6N1, 6N2, 6P14, FU-7 and other pipe in the presence of work points without failure are normal, indicating that the above no problem. Therefore, the key suspicion exchange circuit,