I have a Ring video doorbell that is connected and functioning to the old doorbell wires, which I measured at 16V.
I also have a old Nutone Scoville 10 V, 5 VA transformer tucked in a very hard to reach space in a stairwell (see picture). This transformer creates a very annoying buzz constantly, and I'd like to pull it. I believe that it is somehow stepping down the voltage to 5 V to work with the doorbell chime.
However, I was unable to get a suitable reading on the chime. When at rest, it measures 0.20 V and then drops to about 1 mV when the doorbell is rung.
My theory is that I could simply buy a new 16V doorbell, throw away this transformer and connect the two red wires in the picture to each other. Since the Ring is at 16 V, that tells me there is another transformer hidden under the floor that I don't hear and can't see.
But I'm not sure exactly how these old transformers worked and can't find any instructions online. Thank you for your help.