The Z 240 Matrix consists of 2 identical transformers, offered as an accessory option for studio stereo microphones in the past, but obsolete for many years.
I attached an excerpt of page 37 from the Neumann catalog 130 with the description and technical data for the Z240 matrix. In addition, I found a basic product sheet from 1968 for the Z140/Z240 in .pdf format, which I attempted to convert to .jpeg, as .pdf is a format not permitted to attach on this forum.
