I'd not want to put anything but a dman close match myself; 500mA more current could damage some things, not knowing how well that wall wart is made.
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*I wouldn't be brave at all with modern electronics, but you used to be able to get away with it on some simpler devices.
If you said that, you said a lot there.
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I'd almost forgotten polarity.
You'd think it would be standard, but it isn't.