Or buy a dm19 or dm20 mica capacitor. The bigger micas usually hold up pretty well and are more temperature stable. In a few instances, I have paralleled 2 75pf dm19 micas to get 150pf. They will handle all the current. While using the higher kv rating ceramics, they usually work, but still not sure what the current handling capability is. I have used 150pf cermaics with good success though. Usually rated for 2kv and they are much bigger than a dm19 mica. Don't use the tiny blue ceramics. They won't last.