Hi Craig,
The SD-60s set for AC power do have a rectifier but it is part of the control board. That board will have to be removed if you install the Bluenami. The Bluenami 2.0 is a 2 amp board designed to run on DC power at 12 volts. The reason I would need the voltage regulator is that I run LEGACY and the track power is 18.5 volts AC.
Ray
I will try to post a link that will help to explain all this.