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Pad recommendations for RCA BA31-C mic preamp?

I just picked this pre up and it seems everything I run through it is distorted.There are no input or output adjustments on it, so I guess I'm stuck with one level, but do I need a pad after the mic, before the pre?
If so, which one is transparent enough(model numbers please).
Also, has anyone else used this pre before?
Any applications where it excels?