Sound distorts picture

Tighe

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This is in a japanese color space invaders II cocktail. It has a hitachi tube in it. When the sound is turned up the display shows the vibrations in the image, as if the aperture grill is resonating with the sound.

Anyone know how to minimize this without having to turn the sound down?
 
can you remount the speaker somewhere else in the cabinet?
 
you say it is a Jap game.....is it running at 120vac @ 60hz?
 
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