Total posts : 45366
Sorry to hear of your troubles. Let’s start by trying to separate the AMT-3000 systems. First, is the carrier as strong as it has been?
Second, is the audio source OK? You mentioned a problem with your stereo and if that is what you are using as an audio source for your SSTRAN perhaps that is where the problem lies.
Try feeding audio into your SSTRAN with a known good source. If it still fails to work it could be that the audio processor chip was damaged.
Try to check each major system, RF (usual carrier strength), power supply (measure the voltage), audio source (make sure it is OK), and finally suspect the processor chip.
Please post here any other information you may have and I and others will try to help.
If you think it is the processor chip, perhaps an email to Phil at SSTRAN would be in order.