as someone who has worked on these machines since they were new, I can tell you those power supplies sucked 40 years ago! I'm a big fan of updating the electronics with aftermarket boards. Pascal is a french company www.flippp.com. they have not failed me.....also there are many upgrades to be done as per proper grounding and adding some ground wiring. Also the pins on the connectors suck ass! yeah man toss that power supply. clean power is the best gift you can give to your electronics!