Recently we encountered a problem receiving AM stations, though before everyting worked OK. No 1 channel is received and permanent noise sound is present only little dit changing while trying to search for the channels. Befoe that outage occured sometimes reception came through, so varying with working/not working. I tryed to disconect antenna - sound disappears. Also tryed to turn off all possible devices around receiver including surge protector with no changes. All other functions work as normally including FM stations.