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Quoted from vid1900:I test new components, so I don't replace bad with bad and then scratch my head for 10 minutes, lol.
Do you remember the "Parametric Analyzer" from the late '70's/early '80's sold mainly into the amusement and gaming repair industry? It was connected it to the inputs of a dual trace scope.
It was pretty handy back then for testing a lot of IC's in circuit when you had a catastrophic failure not allowing the board to power up.
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Paradise, NV