Most likely you have a bad solder joint in the unit.
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Will try all these, thanks guys!
In the case that cleaning/turning the knobs multiple times doesn't fix the problem, is repairing a bad solder joint as simple as reflowing the solder (or probably removing the old solder and using new solder)? I'm good with soldering but have limited experience repairing audio equipment. Probably should take it in to a technician to avoid risking turning my preamp into hot chocolate, eh?
Will a local technician do or is it best to go with Krell-authorized? Anyone have recommendations for the Southern California (LA/OC) area?