Report Astec Power Supply for 8100 - How did I mess this up? in NuBus Power Mac, LC & Performa Posted Monday at 10:42 PM Fizz, I like your methodology. I am currently looking through United Chemi-Cons stuff, to closely match the series (the series are old, so no longer made). Low impedance as like you said, switchers cycle really fast. I'll bet you are onto something: I will bet that as the current switches back and forth, there is a ton of impedance in one of the parts I have which is why it only lasts a minute or so on before it quits. I'm no electronics person, but I would venture that is a possibility. I'm ordering from mouser now myself. I really like your chart: thank you for that, huge for future reference!