What state are you in? Yeah, that's very weird that one tube was doing it...then two with a new set. With just one, you'd think it was the tube, but somehow with two new tubes they are both pulling current. Like said above, besides the tubes, you probably didn't do any "real" harm. the iron is pretty robust. You just have to solve what is causing the problem and yes, a tech needs to look at it or Dave directly and why I inquire what state your in.