The NuTone 2067 has an interesting wall housing. It's a mix of designs, some parts of the design are more like earlier Tube Master Stations and other parts are new designs that would be used until the early 1970's.
The 2067 uses a 110 volt receptacle in the upper right-hand corner to power the Master Station, this is the same design idea used in early Tube Sets. Built into the 2067 is a Low-Voltage Transformer, which powers the system.
The Speaker Selections Switches and Terminal Board are mounted in the lower left-hand corner and are designed into one assembly. There is a multi-pin block connector coming from the terminal block assembly, which easily plugs into the the 2067 Master Station.
This was the first model to use this combination design for the selector switches and terminal block, and it would be used in many models until the mid 1970's