When I acquired this A-720 the Class A switch was not properly turning on and off - pressing it turned Class A off, but then it would turn itself back on. The tone bypass switch was causing popping sounds when switched on and off, and was involved in cutting in and out of one of the channels. I didn't see any way to get deoxit into these, but I tried to work some in through the front of the push button around the edges and it did improve.
After sitting on the shelf for a few months though, the original issues are back. I can shoot some more deoxit in as before. But is there any way to get in there and give these a better cleaning?
After sitting on the shelf for a few months though, the original issues are back. I can shoot some more deoxit in as before. But is there any way to get in there and give these a better cleaning?
