Problem with Trio/Kenwood KA-80
I have for many years owned a Trio KA-80 integrated amplifier as the heart of my hifi system. I believe this is the same as a Kenwood KA-80. It has recently stopped working. It works OK when playing through headphones. But when playing through speakers, whenever the volume is higher than very low, there is a click and the sound from the speakers stops completely. If you then turn down the volume, or the music gets quieter, there is another click and the speakers come live again. I have a feeling it is loud low frequency sounds which tend to trip it. I deduce that a relay is tripping, but I have no idea why, or why this has started to happen spuriously. Has anyone experienced these symptoms, and know the cause? Or can you suggest what experiments I should undertake to get to the root of the problem? I am reasonably technical, and have a multimeter and a scope, but I am not an audio engineer.
Thanks - Rowan