I recently got a free Vivitar VI enlarger, but the power supply is broke. (Turned it on, got some sparks, then smoke, then nothing...) and I'm trying to replace it. The output is rated at 18.44VAC and 4.5A (ust over 80W).

One idea I had was a laptop power supply. I see a lot of "universal" power supplies that are in the right wattage. My question is that these universal power supplies often give a range of voltage (e.g. 12-20V). Will this work if I just cut the wires and splice them in? Do I need to do something special to get it to the right voltage? Any idea how these things work?

Other suggestions? I'd rather not find another vivitar transformer, only to have it also break in the near future.