I am building a "quick" stereo monobox. I've recycled a number of parts from old electronics, but can't find 470uF caps anywhere...including that retail store so many people loathe.
What would be the effect if I used 1000uF caps? Would I risk damaging anything?
Not much difference, no. Recycled electrolytics is a dangerous game, though- they deteriorate with age. New ones from Mouser or Digikey would cost less than a cup of coffee.