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Why not just buy the right plug from Maplins? (I did) Less than a quid.
Better still, why not have both types of plug on the end, so it works with all Alesis gear?
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I probably will eventually. . . . What I'd like to know though is why Alesis chose to use a minijack as the power plug? Surely using an 'audio' style jack plug for power is just ASKING for trouble? My OS version 1.7 machine uses a standard BARREL plug, but the later revision 1.9 uses the mini-jack?? Somewhere along the line, the engineers must have deliberately decided to change the specs.Maybe they had a surplus of mini-jacks?
Now I think about it, I was powering a synsonics from an Alesis 9v ac/ac adapter about a year ago, and it died within a couple of days. At the time I didn't realise that it was AC/AC, so maybe that was the reason for the death?