Don't run a deck off the 875 (though have a Thornes 160BC/Hadcock GH228 gathering dust somewhere) so cannot say on the phone stage.
But as to how good the 875 is on music it is excellent once you feed it with a pure power supply. (mains)
I am amazed how Onkyo have built this spec of Amp for £1000. I am talking about the component quality and circuits inside the unit.
The latest AV amps do Hi Fi just as well. You need to go up to systems with seperate PSX units, monoblock to get serious improvements, and you dont get that for a grand!
I do have a soft spot for Cyrus gear, but not for AV.