LM323 is pretty hard to blow. They have current/power limiting and thermal shutdown.
Any chance you got some bad regulators? Maybe try the original LM323K you desoldered to begin with.
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the LM323K you can buy 10pcs of for $30 shipped are probably going to be low quality fakes.
The Chinese make the 7805V part in mass amounts. Someone is probably sticking that 1amp die inside the metal can and calling it a 3a part. Goes into thermal shutdown or whatever near instantly in a high current situation.
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