You could ask :-). If it wasn't clear from my previous posts, I intend to take power right off the contacts of the solenoid of the existing bell.
I'll try to describe the existing setup. The bell has two chimes, and they are metal bars, each about an inch by half a foot. The solenoid is spring loaded. When the button is pressed, the solenoid is energized, moving the plunger and causing it to compress the spring and strike one chime. When the button is released, the spring pushes the plunger back toward its rest position so as to strike the other chime. Of course the power is from a transformer, and the switch simply completes the circuit through the solenoid. As I mentioned before, I measure a steady 12.8 VAC across the solenoid when it is energized (ie, during the time between the two stikes of the chimes).