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NuTone Vintage Door Chime Picture Gallery > NuTone LB42 Westminster 8 Note Chime > NuTone LB42 chime base terminals with arrow

The right hand side of the chime base has the screw terminals where all of the wires connect.

The LB42 has the capacity of 3 entry doors, Front, Rear and Side.  Each door will ring a different note.

The blue arrow points to the volume adjustment knob.  This adjusts how hard (or soft) the plungers will strike the tubes.