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Loud humming from speakers

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greven grevs:
Hello all , I picked up an F-1 Super Battle machine and after some messing around I was able to get it up and running. Thing is , whenever I turn it on I get alot of interference from the speakers. Whenever I touch the knob [which is metal] the interference gets worse. Any ideas on how to get it to stop?

ps - anyone have any information on this game? Its made by Jaleco. The machine is nice , the rumble still works for the wheel  ;D

Edgedamage:
Check your grounds.

Ken Layton:
Check or change the power supply too.

fredster:
If it always has done that you may have a cap out on the PCB.  The board maybe needs servicing.  

If you have another PCB, try it.  If it works okay, then your cab is okay.

greven grevs:
Thanks guys for the replies. I will check the grounds tonight [i hope]. As for the power supply , I am not sure what to look for. It powers  up so the power supply works , do you think it may me going out?
Fredster - I dont know if its always made the noise , I emailed the guy I got it from and he hasnt responded.

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