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Found it! Williams' flash sound board

To complicate things further, the 'Type 1' audio board was produced in two variants;
  • the early L 4 games such as Flash only have one of the two fuses (for the input to the power rectifier) on the board itself; the second is in a clip alongside on the white 'Sound Panel' inside the cabinet
  • the handful of L 6 games with a Type 1 board moved it to the back box, with the use of a remote volume control, but have both fuses on-board. These are Tri-Zone, Time Warp and Laser Ball
I suppose that a 2-fuse board could be used in place of a single-fuse one, with the external volume control shorted out (using the 4-pin plug with a link between two pins, which does this on the early board), but a later board wouldn't have such a handy on-board volume control, rather more of a 'trimmer' component, with adjustment rarely (if ever) envisaged.
 
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