I bought mine a couple of years ago from sinclairs, i tried to run it on a 9v nz plug pack, but it didnt run well at all, ended up going back to the us 10v 1amp plug pack with an adapter ( the orginal one that shipped with the unit) and have never had any trouble with it at all, at 9v i dont think there's enough voltage to run the motor properly in trickle mode.
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