Can anyone give me or point to some instructions on how to do this? I've done a quick search but can only find cursory discussion.

I'm planning on converting my Sinbad over to these Chimes I found here http://www.chimeunit.com/

I love the sound of chimes, I think they match this era of games beautifully.

I just found this at http://www.pinrepair.com/sys1/#sound

Substituting Chimes for the Sound Card.

Because of the sound card problems listed above, many operators take out the MPU controlled sound board and replace it with an older chime unit. Most players find this far more pleasing and consistent to the ear. All system1 games are downward compatible to chime coils.

- Be sure to use chime coils 12 ohms or greater. If coils with less resistance than 12 ohms are used, the driver board transistors Q26,Q27,Q28 will fail. If adapting a chime box from a Bally game, that should work fine as 50 volt chime coils will have higher resistance. Also don't forget to add 1N4004 diodes to the chime coil lugs, with the coil's power lug connecting to the banded side of the diode.
- Mount the chime box right next to the knocker coil in the lower cabinet side panel near the game's power switch.
- Route the 25 volt power from the adjacent knocker coil lug (banded diode lug), which is right next to the existing sound board (and the newly mounted chime box).
- "Daisy chain" the 25 volt DC coil power to all three chime coils' banded diode coil lugs.
- Now move the following wires from the sound board connector to the chime box coils' non-banded diode coil lugs:
orange/black/black wire goes to the 10 point chime coil lug.
red/brown/yellow wire goes to the 100 point chime coil lug.
red/green/green wire goes to the 1000 point chime coil lug.
- Remove the sound board from the game.

Does anyone have an opinion on whether these ( http://www.chimeunit.com/ ) are a good choice for a complete chime assembly, or are there better options out there? I like the look of what this guy is doing and would like to support him if this is a good solution.