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Would it be possible to connect a turntable to a mic input to completely bypass the preamp?
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The output from a turntable is about 47k ohms. You need to get it to about 600 ohms for a standard line. Your mic is about 150 ohms (well, these can vary heavily though).
You need a RIAA pre-amp just to get to mic-input so might as well go for line.
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