This is a MFJ-752 active audio filter I modified for a friend. It originally comes with a 1/8" phone plug for power, and is unfused. I added a fuse holder and DC power pigtail for connection to his shack DC supply. He also wanted a 1/8" audio out receptacle for his shack speaker, so that was added in parallel to the OEM 1/4" jack on the back. These are pretty slick filter units! Here's a few pics...
