When mixing there is a tool outside of your DAW to view the image of the stereo span. Here is the Wohler B&B “AM-2B” phase scope. It takes a stereo signal and transforms it to a visual representation of the pan stereo signal showing the spread of high and low frequencies. Essentially when you mix if it’s squashed it will look flat and when the tonality and stereo range is wide you will have a nice circular representation. This rack mount unit is super and has never let me down as long as its properly calibrated. (See rare attached manual for info). For this unit I replaced the power supply and also decided to replace the bridge rectifiers. I was able to source the exact power supply from the supplier Frost Magnetics in CA. They happened to have 2 original NOS on their inventory shelf. The units are not cheap but if you can get one for little and fix it’s so worth it. 🙂

I was recently asked about this transformer shown above. I also have seen this model installed in some of these units. Please use the below photos for reference.