Palatine, IL
Quoted from Quench:Consider why Bally would add the expense of an extra 1 to 1 transformer on machines destined for the local market only. There must be a reason.
Because purchasing got a closeout special on isolation transformers? 
Actually, Isolation transformers were used on Flash G(not Xenon, typo), and Firepower for the florescent tube. At the time it was a UL requirement. With the Isolation there is no physical path to ground and it minimizes the electrocution hazard of having 110v AC on the backbox.
