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The user manuals usually have the maximum rated amperes specified. Whether they are correct or reflect empirical reality, not sure.
I have seen most models specified 100mA max on positive voltages, and mostly 10mA on negative pin 21, be it -12v or -5v on different models. A3000 manual has an error in it on the negative voltage (incorrectly says both -12v and -5v on pin 21, so also not sure to believe the higher 50mA figure)
I think A1000 may have had different ampere ratings.
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