Galaga/Bosconian boards Hummin

parabolic

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I have a bosconian which plays fine, but after a while of being on the hum through the speakers gets louder and annoying. I included Galaga in the title as they are the same boards, and hopefully someone will have an answer for this.
Im thinking filter caps on the sound circuit on the main board? Or would it be in the Power supply?
Thanks!
 
Thanks Dave - all 4 or a specific one? on the 220 mfd can I go to a 470? Only have a 16v in 220 here. it was a 220mfd 25v. I know you can generally go up in volts but not down. Im not to good on cap substitution. ;)
Thanks!
 
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