Quoted from bingopodcast:In contrast, I don't find the Bally ones to be particularly terrible. But maybe that's because I deal with them so frequently? Regardless, it doesn't matter the manufacturer's jones plugs used. On most Bally games, the male side is actually the problem. It will curl. I don't know of they used fewer layers to shore them up, but they seem particularly susceptible to heat warpage.
Again, doesn't matter. You can replace with any four prong female jones plug and it'll work.
Also, that is either the match feature or a pricing plug. Is there a manual for this game? Probably not (too early with too many flippers) so your plug will be shown on the schematic.
Smallest I have is a six position female. It'll work, but do you want to look for a four position? Up to you.
I've only heard stories (I'm not a Bally guy and I didn't choose that but apparently my tastes did, check out my collection page... I didn't try to avoid Bally games...) and if you look at them (the female jones plugs, not the machines themselves, oh god the argument that could have caused with others) in comparison you can remotely see how they're worse in design that something like the Gottlieb ones. Of course they all do the same thing and work great and are great when perfectly clean and new from the factory, that is not the problem, but when things start to get a little mucky and dirty, the extra connection areas the Gottlieb/Williams plugs provide start to be a big help that shows.
So, if somebody were to say "Check out my Bally machine!", I wouldn't advise them to change out the jones plugs if the machine is working fine like it was some kind of emergency comparable to leaky batteries in solid-state machines, but in the situation here where you are going to have to replace an equally-as-hard-to-find part ANYWAYSSSSSS, I would definitely suggest it. (So you don't have to do it twice)
((You, meaning, Ryan)) 
Normally I would even suggest it if somebody was troubleshooting a Bally EM and had connection issues to where they MAY have to replace them that they should consider giving it a go, but in this case, on top of that Ryan has no choice but to replace them anyways. So, it's a "might as well" situation. But either way, yes, Bally plugs will "work" if they are still in the proper condition to do so.
Maybe it's a bingo thing. I wouldn't want to unplug and move things that huge much either! 
Some of those pickups were more incredible that they happened than a rare game pickup! Just kidding, just kidding.
