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hello, you may really have a weak -12V as already suggested.
don't forget than modern psu still have the -12 for... nothing on modern pc.
so, it's usually given for 0,1A but i'll not be surprise if cheap psu don't really respect that.
i have a picopsu for various testing (but not amiga), and the -12V happily fall at -10,80V with no load on it...
this may be low for the opamp of an amiga.
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