Designed to eliminate ground loop problems in video signals
Allen Avionics 4 Channel 75 Ohm Hum Eliminator with Sync
Allen Avionics 5 Channel 75 Ohm Hum Eliminator
Allen Avionics 50 Ohm Hum Eliminator
Allen Avionics HEC-1000 75 Ohm Single Channel Video Hum Eliminator ABS Housing
Allen Avionics HEC-2000 75 Ohm Hum Eliminator