Marshall-Selmer: vieilleries sur la table d'operation

I have 1998 catalogs from Philips and Mallory so I can add a little more.

Mallory recommends testing the DC leakage current after 5 years
storage. Philips recommends something similar and includes a field
re-forming procedure in their catalog. Depending on the product line
series, Philips shows power-on life expectancy ranging from 3000 hours to
15,000 hours (full voltage and ripple current at max operating temp of 85 C
or 105 C). Graphs are also included showing how the power-on life
expectancy increases with decreasing ambient temperature; in most cases
this life expectancy exceeds 20,000 hours with a 25 C ambient. One of the
catalogs shows how the DC Leakage is affected by shelf storage (no power
applied) at 40 C : the line is flat for the 2 year scale of the graph. The
leakage increases significantly during the same 2 year period with a 70 C
storage temperature. Reading between the lines it appears that shelf
storage at much cooler temperatures *could* be expected to result in quite a long shelf life.

salope