Quoted from PinMonk:
Something I've been wondering - in original Houdinis, once the 48v was moved to the Meanwell power supply with the upgrade and that giant transformer and remaining half board left over was only used to run 12v/5v, couldn't that whole transformer and boards be removed and just put in a multi-output 5v/12v meanwell switching power supply instead? So you'd end up with two meanwells side by side and it'd be a much cleaner look for pretty cheap.
Yes, you could replace the toroid with a combo 5v/12V or one of each, which is what the 'toaster' looking power supply that AP moved to has on the inside, , three switching supplies 5, 12, and 48. Most AP games with the toaster don't use a meanwell, as they have gone through a series of cheaper versions, looking for one that can deliver solid power and with a decent level of fan noise. The first were just way too noisy, then they had some that were way too weak for some of the games, like Houdini, to what I believe is currently being used, but not sure if anything has changed since I left.
Some of the toroids have started to have failures on the 12V regulators, and have had to repair or replace the modules. So certainly when that occurs, it is worth considering moving to switching supplies for the 5V and 12V.
Issue with toroid is the voltage drops with house power, which can make catapult unreliable as house voltage varies. Downside to the external power upgrade, is they did not include a cap with it (something I questioned at that time), which the toroid had. So while the toroid would have variations in voltage that can effect some as sensitive as a catapult throwing close to two feet, it had caps, so it provided that voltage at a consistent level. If you don't have the capacitor upgrade with the external supply, it can result in power drops under heavy load (e.g. seance MB when the magnets are very active). You could argue that if you don't have the capacitor upgrade, but have both supplies, that splitting some of the load to the toroid, other than the catapult, could be beneficial.
I have the original supply with no extra supply or cap upgrade, and have no issues, but my house power is rock solid. I have replaced the 5v/12v regulator module.