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Tom, can't disagree that replacing those old carbon comp resistors it the right way to fix the C3. I have equipment spread between two homes, one in MD; one in FL and didn't have a reliable one in FL. It took about an hour to get the one in FL into shape. Only one resistor had really drifted. But the rest need to be changed when time permits. Interesting how accurate (mind you, service grade equipment here) it is for normal non-professional/lab use.
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