Todd, I would think you are asking about the K3 or K3S line out jack. Yes, it is a 3.5mm (or 1/8 inch) jack - it is stereo, so you should use a stereo plug. 73, Don W3FPR On 11/11/2015 5:04 PM, todd ruby wrote: > Hi all > Is the line out jack for a ⅛” plug? > >