Bought this for my dulcimer after looking at the rave reviews. Maybe my ears are too sensitive compared to others but this sucker hums like crazy. I've actually returned it twice and both have serious AC hum. I ended up getting H&K pickups from Oregon and the sound quality is so much better and the derived SN ratio is much better. I wouldn't use this puppy for any serious recording but it does double very well as an amplified stethoscope =)