I found this forum through a web search and after reading some of the posts, I figured this would be a good place to get some help. I have a Lincoln SP 250. Its older and I bought it cheap because it was missing some parts. I got it home and hooked it up to find that the capacitor bank was sparking. Upon further investigation, I found some burn spots in the capaitor. I called Lincoln and they want nearly $600.00 bucks for a replacement bank. To my question, where can i find capacitors to build my own bank? It has 4 mepco/Centralab capacitors measuring 30,000 UF -10+75%, 50VDC 75 Surge, 85C Max. It has been a long time since I had any electrical classes so maybe someone can help. I know that 30,000 UF is capacitance , and voltage is obvious. What does the -10+75% mean? Can I maybe use different capacitors to eaqual the same capacitance? Please help. Thanks.