Yeah, that's wrong. 
I'm guessing someone had a missing or non-working gottlieb sound board and tried to shoehorn this williams sound board into the game just to get the speakers to spit out something.
(Topic ID: 203322)
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Spider-Man, The Amazing
Gottlieb, 1980
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Also be sure correct the wiring and connectors so you can actually install that new board.
Keep in mind that the sound board used in spiderman is notorious for chip failure, and the chips are unobtainable. So be wary of untested sound boards on ebay and whatnot.
Here's an aftermarket replacement:
Quoted from CactusJack:The gray box is just an encased transformer. So, more than likely the source for 12vac. But the board requires 12v center tapped (12-0-12). So there should be all 3 wires used.
That rear gray transformer looks like an isolation transformer used for games that were routed in Canada.
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