Unlike the later made VW and ZW transformers, the early PW "V" and "Z" had a separate winding for each of the four outputs. The later VW and ZW shared common windings, so the failure of one affected all four. Also, the earlier "V" and "Z" were / are better for good source powering because, not being shared windings, and not sharing amperages, you have full amps from each post as listed, no drop due to having shared with other of the four output circuits. I have more than one of each, the "V", "Z" and VW as well as ZW..... prefer the earlier models for better sustained supply. IMO...….
Jesse TCA
