Don't want to hijack the thread,but i dont think you realize that skynet and liteon were 2 of the major psu makers since the early pc days. Commodore had nothing to do with the psu design other than passing them specs for size, cooling, and power required. These are off the shelf standard pc psu's just like any pc used. The same basic power supply scheme is still the same today, the only difference is switching parts with less gate resistance and such and some run higher switching frequencies which is debateably better. sff,matx,tfx, it doesnt matter all the same designs and i can give you half a dozen examples of junk brands. Even some of the OEM brands fail and have substandard caps,poor filtering,horrible ripple,and shared rails. You are kidding yourself and others if you think new psu's are superior(well very few are).
Many a4000's simply fail because of overheating caused by fans being dirty,neglected or bad. When changing to a quiet fan the CFM needs to be adhered to since it also cools the entire case. Never speed reduce a 4000 psu fan.
I Agree! The original supplies are almost bullet proof, but, must be cared for every 20 to 25 years or so, recap it. An ounce of prevention......