Yes, understood. I'm going to give it a go and see if I can test and replace the defective diode. Found them for about $25.
If anything, I can replace that terrible amp selector arm with the new one.
Thanks for the warning though!

Steve

Hi everyone, I currently own a Century AC230 (see pic). IMG_1717264432229~2_1724944328530.jpg I'm going to get a Century ACDC 230/140 for very cheap but the seller says the welder "needs a diode". I don't know what a diode is, what the price would be, or if I could even FIND one for this p...