Ok - I think I may know what's wrong here.
I went to PSP website and noticed that the Bally E 120-162 pic that they have listed differs from the one pictured by PBR.
http://www.pinball.co/Products/28631-e-120-162.aspxPBR have listed Part #A2916 as a dual part reference being E120-162 and also E120-127.
http://www.pbresource.com/sockets.htmlTherefore could it be that PBR have made a mistake here as linking both sockets as being identical when they are not?
I have attached the below pic of the new socket on the left (purchased from PBR) and the old socket on the right (that works perfectly). The older socket is also a visual match to the socket listed on PSP. The insulation rings on both sockets are in differing locations leading me to believe that this is a cause etc?
I have not tested voltages etc.
What do you guys think?