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点评
灯丝干扰有点儿,虽然很小了,但灭绝还要折腾下..
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点评
就是电位器关死有微弱的貌似交流声,感觉就是灯丝没处理好,不是那种低频嗡嗡声.
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点评
如果是这个倒是简单,估计不像是
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点评
嗯嗯,正是下一步调整考虑的
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点评
减少47欧电阻呢?
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