Terry Schwartz wrote:
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Not unusual for high value resistors to fail open.


** Well they don't fail short very often - but high rates of such in new looking equipment is very unusual.


This was also true for leaded resistors.

** Only those with lots of DC across them, not the case here.


The same environmental conditions that cause the surface corrosion
contribute to the resistor failures.

** Yeah - I did figure that.

But chip resistors are unusually vulnerable cos of exposed silver.

...... Phil