[Dave Moll]

If the original poster should check back (last activity some three hours after the initial post), I wonder what progress has been made.

In case it is of any help to him or any other Dictograph experimenters, I attach below a document setting out how I have wired my setup (in a way that avoids having units permanently wired together).

Also attached is a picture of the interconnection box, which also contains a 6V power supply (4x "C" cells). Although only four connectors have been installed, up to seven are supported.