My soldering gun failed. The primary coil shorted out after who knows how many heating and cooling cycles. So I decided to rebuild the primary coil. After doing so, I plugged it in and after 10 seconds heard the sound when electronics fry. So I pulled the cord. Oh, 120V 60hz. My question is: "Is there a grade or type of coated copper wire I should have used? What I used was the coil wire from a automotive solenoid. Definitely a bit thicker than original. Perhaps not enough turns to manage the voltage?