My new '62 Princeton Chris Stapleton Edition is making a noise. This was sold as new on Reverb but I'm pretty sure it was a store display due to the price sticker on it. It did however look new and including everything except the original box. Please listen to my video and let me know if you have any ideas. Thanks! It mostly only happens at one frequency. When it's making it, it is consistent. I move the amp it might go away and then show up again later. I took the back off to see if the tubes were tight. One of the small tubes was slightly easier to move around than the other. Also looked for loose screws. I also did consider that something else nearby is rattling and that does not appear to be the cause.