If it is AC out it will not be regulated nor do you need to worry about plug polarity,
just finding one to fit! This..http://www.maplin.co.uk/ac-ac-fixed-voltage-high-current-power-supplies-24
The 3A verision should be fine. If you Google for "12volt ac wallwart" you will
probably find dozens, probably cheaper but the quality can be dubious.
y'all. AC/AC/ rats are absolute buggers for injecting hum into nearby audio leads, keep
them well away!