Tube amps you have heard with Quad 989

I listened to Quad 989s being driven by the new Plinius SA 102 amplifier, a 125 Watt high current SS design. The combination was pretty special, and belies much of what has been written about the Quads. These speakers were astonishingly good to my ears.

I would like to find a tube amplifier that works better than the Plinius, if there is one. The 989s can sound hard and unpleasant when paired with the wrong amplifier - innersound being a case in point.

Has anyone heard the 989s with tubes and liked them?
Are atma-sphere 60 watt monoblocks a possibility?
Has anyone heard them with the Wolcott Presence?

If you have any listening experience, you could save me some steps.

Thanks