Hello there, I am working on a Vintage Audio Mixer SoundCraft Folio SX and the previous owner lost the power pack. Upon researching I think I found a picture of the power pack for it but as per the store its not available anymore. On the picture of the power pack I noticed that three pin out put and is 17.1-0-17.1v and on the Mixer Unit itself has three pins a red, a gray, and a black wire connected to the circuit board. I tried tracing them and it look like the common or ground wire is the gray. I can’t look further the board cause it is riveted but it looks to me that the wires went to two separate recitifiers and I can barely see the regulator ICs. I have a spare AC/AC adapter 16v 1250ma. I tried connecting it to the gray and red wire and I had the LEDs on the Mixer light up. Can anyone tell me what the other circuit where the black and gray is for? Can I get away with only one circuit having an AC17v?