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Roland mc-303 Hey ! I plugged in my 303 to find this loud humming ! It works in conjuction with the volume control.I noticed that the wal wart receptacle is not the original one! could this be the problem? everything works on the machine, just want to get rid of that humming! Jimmy...

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Yes, that is the likely problem.

The unit takes a 9 volt AC adapter with enough current.

Several sources are selling them on eBay. Search for mc-303 and some will come up.

Likely the adapter you have does not have enough current, hence the regulator within the mc-303 drops out of regulation paprt of the AC cycle.

Posted on Nov 18, 2009

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