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.
This may be a long shot, but is each input individually adjustable for gain? My Levinson preamp has this feature so that all inputs can be adjusted for uniform volume. If so, it may be that the inferior sounding input simply is set a tad lower in gain, which we preceive as sounding veiled?
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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