This is essential how I hooked up the transformer. Except I have tied pin 3 to pin 1 (Chassis ground) on the output, because I'm using RCA (unbalanced) outputs. The problem is this shuts down the phantom power circuit. I must be missing something that's very obvious. Of course, I'm at work, thinking about it, rather than having it in my hands to figure out. The inputs to the transformers (primary) are floating as in the diagram attached to Pins 2 and 3. As soon as I attach the chassis ground wire from the Phantom power circuit, it shuts that circuit down. That's what this diagram says, is to lift the chassis ground on the primary side. Also, If I connected Pin 3 to Pin 1 on the input side, that would produce a dead short for the phantom power supply. So that wouldn't work. If I leave the phantom power chassis ground disconnected, it all works, but with massive hum. Unfortunately, I won't have time to test anything tonight, since I'm working late.