I purchased this as a junk item and used it occasionally. The reason for the "junk" status at the time of purchase was severe crackling, but I didn't notice any particularly loud crackling. There is some crackling when operating the knobs. When using poorly-contacting shields or guitars, I've experienced larger-than-usual noise compared to other models, so please be aware of this if you are considering purchasing. One of the nuts on the PHONE jack is missing. I have performed a basic cleaning and metal polishing as much as possible. Since this is an old item, I am selling it as junk. I do not guarantee its operation. Thank you for your consideration.