I have an old DeArmond magnetic on my one electrified harp. I like it fine. My concern about transducer type pick ups on Autoharps is they pick up everything from the string vibration to to the bars hitting the covers when they are played. They sound like you are harnessing a team of horses. Magnetics pick up just the strings.

I have a friend who uses a Lavaliere microphone clipped to her blouse and that does a good job as well. But it has to be clipped in such a way as to not hit the back of the harp. Easy with women, not so much with men.

Don