Common Mode Noise Filter – Coax Touch Lamp RFI Kit Store / Touch Lamp RFI Kit AC Cable Noise Filter for Standard 120VAC Plugs - 1.4" ID AC Cable Noise Filter for Standard 120VAC Plugs - 1.4" ID SKU ACCF-1.4 $12.95 Buy Now Typical user comment: The filter was quite effective. Was surprised that it actually reduced the noise level more than the signal so S+N/N improved by 1.9 S units. Bill