Re: motor can’t hold up pen arm

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I didn’t have an adaptor for UK plugs when I first built my Eggbot, so used a Maplins multi-voltage regulated supply at 9V, 1.4A, which worked fine.  

However the supply provided gives motor jittering on the pen arm.  The pot was already a maximum, wich both motors easily turned by hand, so no joy there.

The supplied switch-mode psu seems to be giving 1.5A / 9V as expected.  I really don’t want to tie my multi voltage supply to the Eggbot – any advice on what I need to look for in a replacement supply?