Something I found that might stir the tweakers: My preamp has multiple single-ended inputs. I found that input 2 sounds better than input 1 - less veiled and more detail. The preamp is about 5-years old, which may be the culprit. FWIW, it's a Krell KCT.
is it possible that there may be some oxidation in one of the input ? try cleaning with a tooth pick and cramolin, or the cleaner of your choice and see if the "sound" becomes uniform across all inputs.
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