Evening folks. I've had a Princeton '68 RI for about a month now. It's been good. Today when I turned it on to play I noticed a buzzing that I hadn't heard before. I recently had a Fender Champ 12 show up DOA so I was a little worried. After some troubleshooting I determined it was the on board reverb, rather than my guitar, cables, pedals or power supply. I turned it off and used my reverb pedal but returned to the onboard reverb later in my session and didn't notice it. Then it came back, and it remains. Has anyone else experienced this? Surely it's not supposed to be like this? I'd post a video of the buzzing but I'm a bit technologically impaired, and it's hard to describe, but it's this buzzing lying underneath the guitar and everything, and it stays. If I turn the amp up, the buzzing turns up with it, emanating from the speakers. I haven't been able to find anything noting this specific problem with the Princeton '68. I believe I am still within my return window with Zzounds but I'd hate to send this back, since I might get shafted on the Champ 12 I bought just prior to this amp, which died a sudden death. Can anyone shed light on this issue for me? Is there anything I can try and do on my end? Thanks in advance.