I recently purchased this Fryette PS1 from a second-hand platform. It was produced in 2015. The attenuation function works fine, but when I turn on the “operate” switch, as long as it’s connected to the cabinet, there is a constant background noise regardless of whether there is an amp signal or not. The switch at the back doesn’t help either. The noise is not too faint. You can listen to the video I recorded to determine if this is normal and if it can be improved.
Hi, I have the same PowerStation as you, and when I put it in “operate” mode, I hear a noise very similar to yours, although less loud. It would be interesting to hear from someone from Fryette support to see if this is normal or not.