Cleaning up my games in advance of hosting league and noticed that some of my EM’s are completely silent when the flippers are engaged. Other games you get varying degrees of buzzing/chattering. Sometimes it’s even the same flipper on the same game - hold the flipper up and no noise, do it again and you get some chattering.
Curious about the science behind that … And of course if there’s a sure fire way to get rid of any of that chatter.