I need wiring diagram for very old (1973) NuTone Intercom System

My house has the original NuTone Intercom system - probably from 1973. It is a very simple one speaker by the door and talk/listen monitor upstarrs. At one point it was working, but we had work done in the house and the wires were diconnected. I now have a bunch of wires that I have been trying to reconnect. I can't figure out which or how many wire(s) go to the tranformer, which to the outside speaker, which upstairs. If any one has either a wiring diagram or knows of a web site that has wiring diagrams I would greatly appreciate it. -Alan Marks

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