Quoted from yancy:
Random observation from that under playfield photo, assuming standard Williams coil colors, they used blue (strongest) for the left flipper, and orange (second strongest) for the upper & lower right flippers. Makes sense.
Someone will have explain to me like I'm in kindergarten how Williams could run these at like 70 volts or whatever, with acceptable fade, yet in a JJP game the exact same coils have to be under-driven to avoid horrible heat fade. And they're dual-wound, which I thought was supposed to avoid the hold side ever getting hot, which is apparently still an issue for JJP.
I have a TOTAN with (factory?) blue flipper coils that, after I rebuilt them, felt like they could knock a hole in the back of the cabinet. And I've never noticed them fade enough to change how the shots feel.
I think the multi-balls are generally shorter and less frequent on older titles.. moderns seem to have much more MB focus.. this means you are basically pulsing the high voltage on the flippers frequently for extended periods which would explain more of a feeling of power fade. The hold is not the issue.. it's that quick successive flipping which really drives up the heat from what I gather.