patrickh99, I have considered liquid cooling but the welder has to be kept as light as I can get it. The welder frequently goes up ladders and scaffolding in my hands.
The heat sinks are working very well. They keep the welder about 30 degrees above ambient temp now.
I ordered 4 capacitors several weeks ago on ebay. They came in and I tested them before instillation. I'm glad I did. They tested out at about 10% of the face value. The seller issued a refund and I'm still hunting for suitable capacitors. They're difficult to find without spending $80 each.
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