I am getting ready to build an impedance matching transformer using the Bogen T725. I plan on building the "uni-match" which can be found here:
http://www.crystalradio.net/soundpowere ... ndex.shtml
However, there is something in the schematic that I don't understand. At the bottom of the schematic it shows a connection that appears to go to the laminate core of the Bogen. Is that actually a connection to the frame of the Bogen? Could it be a misprint? I ran a continuity tester all over the frame of my Bogen and it appears to be totally non-conductive. It is covered with a varnish like substance which I made a small effort to scratch through, but still couldn't get an electrical flow. On that page, all of the Bogen diagrams show that connection. Can anyone tell me what it represents?