I've seen a lot of threads about Galaga buzzing but never seen anything more than recommendation to cap the sound section of the PCB or check the marquee bulb. I've disconnected the marquee light altogether and recapped the PCB with a Bob Roberts kit. This game does have an arcadeshop switcher installed before I got it.
Here is a video of the noise:
http://www.youtube.com/watch?v=tcV_y43ztrc
Any other ideas on what I could try?
Here is a video of the noise:
http://www.youtube.com/watch?v=tcV_y43ztrc
Any other ideas on what I could try?

