I have a louder than normal HUM that comes from the speakers while the game is playing, goes away during attract mode.
Also will HUM louder as the volume is raised and lower when the voiume is lowered.
Where should I start looking to eliminate this?
Is the large CAP hanging from the sound board a suspect?
Are your infinity lights working properly? Ran across a Space Invaders years ago that had a weird hum as well albeit it was more pronounced in attract mode than in actual gameplay. One day I saw a burnt connector on the Auxiliary Lamp Driver board and fixed it. It stopped right afterwards. Don't know if that's the case here but it's worth checking out.
just a thought, try removing your sound board from the brackets, so not grounding it, does hum go away?
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Kaysville, UT