Could someone please advise me as to who could repair my Heathkit AP-1800 , or recommend a qualified repair shop. My wife was attempting to use her karaoke machine, which is connected to the AP-1800, and I believe she had the volume set to high and then toggled the mute switch. Right now there is no output at all, not even any static. This unit has never been repaired prior to this failure, and I did check the fuse which is good. Any help would be greatly appreciated.
