’I would think that you would need a powerful tube amp (100-200 wpc) to drive these speakers"
Not a tube but there’s a steal of a deal Krell KSA-300s listed for sale right now for $3K and that should drive your speakers with some serious gusto. A 185 lbs. of solid America made steel. Might need to nail your furniture down to the floor to stop them from walking across the room...