I picked up a just about mint condition KA-7100 yesterday knowing that the right channel was a bit quiet and a bit scratchy. I got it home, opened it up and cleaned all the pots and switches with Deoxit and applied some Faberlube. Later, when I turned it on the relay clicked and everything worked perfectly, for about 30 seconds. After that the volume dropped to the point I could barely hear it.
This is what it is doing exactly. I power it on and in about 3 or 4 seconds it clicks on but the volume is almost nonexistent. The volume dial does two things. When it is turned all the way down and I turn it up a tiny bit it sounds like the relay clicks again, if I go back and forth at the lowest point on the volume dial it clicks repeatedly. It does the same thing when the volume is turned all the way up, it clicks when the volume is almost at maximum.
Does any one have any idea where I should start? I have a DMM, soldering iron, and most of the basic tools needed. I also have an oscilloscope but I don't really know how to use it, it was given to me.
Thank you for reading.
This is what it is doing exactly. I power it on and in about 3 or 4 seconds it clicks on but the volume is almost nonexistent. The volume dial does two things. When it is turned all the way down and I turn it up a tiny bit it sounds like the relay clicks again, if I go back and forth at the lowest point on the volume dial it clicks repeatedly. It does the same thing when the volume is turned all the way up, it clicks when the volume is almost at maximum.
Does any one have any idea where I should start? I have a DMM, soldering iron, and most of the basic tools needed. I also have an oscilloscope but I don't really know how to use it, it was given to me.
Thank you for reading.