Nice venting wonder what was going on there lol. Looking forward to seeing these beauties finished
It appears to have been a transformer. The mounting holes and the shadow of filth and overheating on the side of the cabinet were a dead giveaway. That's why I didn't bother powering it up. Maybe it was used to power the GTB flipper mech 
I've had a few like that with the Gottlieb flipper mechs and a seperate massive transformer to run the hahaha
My latest pickup has just that gottlieb flipper mechs in a Williams machine
