Folks, As I was going thru my storage closets in the radio shack, I came across another cable. This is the cable that connects the PS-4 to the L4B amp for keying with the 2 pin connectors at each end. Quite a rare find. I sold one last week, but someone else emailed me looking for one and I deleted my mail. Whoever was looking for one of these cables, please email me again. 73 Saad N5FF