I purchased a set of Numark ES-701 headphones with a broken plug. The cables have only 2 conductors per side making them electrets, the 6 pin plug is just for show and to ensure polarity. My issue is I do not have the converter box to find out the rating on the transformers. If anyone out there has a photo of the inside of one of these converters, they were also sold under the K-Mart brand and radio shack. I would like to build the converter box. Very little information out there.