Randy: Somewhere around a month/six weeks (?) played 3-4 hrs. per day.
Just one of those things, you know, where quite suddenly it just seemed to really 'open up', and you look up from whatever you were doing and go "Gee this is sounding REALLY great"!
FWIW, I've had no urge to fool with tubes, cables etc. Just buy more music

Lon: I do have the IEC connector, and have installed a modestly priced power cord from DIY cable. I think Eli's point re. attached power cord is a good one, though
Keep us up to date on your impressions, Don