Ms. Pac-Man audio hum - is it normal?

TheMaze

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So I'm still tinkering with my Ms Pac-Man, I just re-capped the PCB (but not the linear power supply) and I still have audio hum. Is audio hum just expected on these? It's not objectionably loud, but it's definitely there.
 
It's coming from the AC attached to your board it's normal
 
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