If your in a hurry, here is what I've done in the past. I did this for a DEC PDP 11. It needed the 5V. Get a modern switcher that meets the power requirements and one that takes external lugs and supports external voltage sensing.When you crimp the lug at the far end add the sense wire so that both are in the same lug. Triple check. Oh .. if you really want to make sure, build a load for the supply and make sure it runs under load. I was lucky, I had a power supply load bank. If your current is under 5 Amps or so, you may skip bringing the sense wires out. Add OVP (Over Voltage Protection) if you can. You can finds many on the usual auction sites, an depending on where you live check with armature radio (ham) types. Cable up to where the original supply went. use lugs or other means that can be easily removed and will make good electrical connections. Cover all connections with tape or heat shrink. All that effort will pretty much cause the supply you have been looking for to show up out of nowhere. On Sun, Apr 10, 2016 at 7:19 PM, Josh Dersch <derschjo at gmail.com> wrote: