There seems to be plenty of evidence that meters like the 3458A improve
stability over time. I believe that most/all is due to improved stability
of the LTZ1000A.

Does anyone know if desoldering one and resoldering resets the aging
process? I see a number of used LTZ1000A ICs on eBay that look like they
have been poorly removed. They are about the same price as a new LTZ1000A.
I wonder if
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