KEY - 207B Selector Diagram for 1 and 1A Key
By Ken Martin, ; posted March 1, 2006; hits 1559
| Here is a diagram that's related to KEY systems 1 and 1A. It's a diagram of the 207 selector as used in intercoms. I think it is a 207B. With a little work this could be modified for such things as trunk testing from 1 to 10 trunks. Just follow the leads down to te T relay contacts M2 and M4 to pick off your Tip and Ring. Just be sure nothing is wired to terminals 16B, 26B and 39B. Circa early 1970's. |
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