I picked up a few late 70's parts playfields (2xGottlieb, Williams and Bally) to start experimenting with. I'm planning on building a 70's style machine and have been trying to figure out what's needed for a power supply. I've read lots of things that say 50V but some that say older games can get away with 24V. One of the posts said older Williams and Gottlieb could do 24V and Bally 50V. Is there a site that tells specs on various coils? I'd likely be using coils like the A-17875 and A-5141. Assuming 2 flippers, 2 slings and 3-4 bumpers what might I need for amps as well?

Would I need something like a 48V 7.6A supply work? Could I use a 24V supply instead or would that end up with flippers that would be too weak? Also would a 3A supply be enough? What are the specs of a typical late 70's Gottlieb transformer?

Lights and switches will likely be done off of separate power supply.