I will assume that the white mark sides are neg and be sure to put them in right. I did find that I had some of the tantulum type and those do have a + sign on them to show polarity. When I was getting some caps a few weeks ago a guy was getting supplies also. He builds his own boards and everything. He said something about coupling caps as being a bad thing and to get rid of them. Does that make any sense to ya'll. He didn't have anything good to say about the caps I was getting either ( the tantelum gum drop looking kind). Steve C