Price: $79
This Williams Sound Overlay board is a direct replacement for Whirlwind pinball machine, board number C-13287. This board is only used in Williams Whirlwind.
![](http://pinballpcb.com/wp-content/uploads/2021/01/sys11SoundOverlay-1-936x1024.jpg)
![](http://pinballpcb.com/wp-content/uploads/2021/01/sys11SoundOverlayMounted.jpg)
Each board comes complete with a manual that includes instructions, parts listings, schematics, and a board layout drawing.