To the OP:
You suspect RF noise, this might be just what it is (or was, in this case). Not coming through your power line but through the air. We should look not only at bad old appliances but also all the wireless we have today.
You suspect RF noise, this might be just what it is (or was, in this case). Not coming through your power line but through the air. We should look not only at bad old appliances but also all the wireless we have today.