So - the Hegel 160 is gone, sadly. What a beautiful component and well deserving of all the praise it received.
I replaced it with a forgotten Sony receiver I'd bought from Crutchfield a few years ago. Set it up, made all the IC and speaker connections (still the Adagios - which will be picked up by the buyer in a few weeks) and started with Roxy Music's "True to Life", followed by "More Than This."
Verdict: What you'd expect. Flat soundstage, little instrument separation, somewhat muddy presentation. The Adagios and the Oppo tried their best to present the music well, but were limited. Still, the Sony wasn't especially bad, considering what it was made for.