FYI, even though the noise went away or was reduced significantly, I replaced the signal tubes in the MC275 with the New Gold Lions. As a result, the system appears quieter when listening to those piano notes.
I'll report back after a day or two when I can sit down and listen to it without interruption.
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Solid State System: PS Audio Dectet - Innous Zen MK3 - Schiit Audio Yggdrasil - WireWorld Eclipse 8 Cables - McIntosh C48 & MC452 - Sonus Faber Guarneri Tradition - JL Audio F110v1 (2) - Stillpoints
Tube System: PS Audio Dectet - McIntosh MR88 - Innous ZenMini - Chord Qutest - WireWorld Eclipse 8 Cables - McIntosh C22V & MC275 - Sonus Faber Cremona Auditor - Stillpoints & IsoAcoustics Gaia III
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