I have an old Adcom amp that I use in my keyboard rig and like it. Lately, it developed a buzz that comes and goes (it stops after 1/2 hour or so of operation). The buzz is not coming through the speakers, but a physical, 60Hz vibration. I suspect it is a transformer.
So, how do I stop it? Hot glue (will that melt when the amp is hot?)? Jam a piece of something under it to wedge it?
It operates fine. A few years ago, I upgraded the power supply with a kit from some guy on the internet. I soldered it up and installed it fine. I am not sure if this is the section of the amp that is buzzing as I have not opened the thing yet. I will do it in the next day or so, but I want to be prepared to repair it before I open it.
Ideas for stopping the buzz? Ideas for diagnosing? Since it is a physical vibration, I figured I would just pull the cover and use my ears and a non-conductive poker to find the offender.
Thanx man… that is all that it was. Actually I don’t think the screws moved, but I think there is a rubber pad or some insulator under this huge toroidal transformer and maybe it is breaking down over the years?? maybe?
I dunno, I did tighten up the four corners and it apparently worked.
Apparently, according to those tech illuminati of the internet, this amp had a less than perfect power supply. So there are kits out there and I soldered one up… and I did a three-prong plug… cheap fun. Interesting that this amp still has a following after all these years.
I never put this amp in my big home audio rig so I am not real sure how it sounds… You would thing a geek like me would have tried it out but I guess I just don’t like all that work. For my keyboard setup, it sounds really good.