I'm running McIntosh MC-275 Mk IV with the Outlaw 990. No problems. I love the sound. They seem to have a good synergy with the Outlaw 990. I love the way piano notes hang in the air with the tube amps. I use tubes for both two-channel and multi-channel listening (i.e. movies).
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Ron Carlton
Dallas, Texas
Outlaw 976 (990 retired, works great), (2) McIntosh MC-250, McIntosh MC-275 MKIV, McIntosh MC-2100, Cambridge Audio Azur 640C, Oppo DV-981HD and BDP-95, Toshiba HD-A2, Klipschorn's, LaScala's, (3) Heresy's, SVS PB12 plus/2