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Assuming your 1/4 cable and/or adaptor are TS and not TRS:
Does the adaptor short the cold to ground, or does it leave it open...? Somehow it is converting 3 wires into 2.
There are many ways to wire an adaptor. Check the manual of your preamp for what it expects for an unbalanced input and then use their recomendation.
Maybe I should have asked first, what exactly are you connecting to what, with what kind of cable-plug is on each end? Be specific about whether any 1/4 jacks or female sockets are 2-wire TS or 3-wire TRS.
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