Bad chip resistors?
Trevor Wilson wrote:
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**If I have a weird fault, I always suspect high value (100k) or low
value (100 Ohms) resistors.
** That is why I went on a bad resistor hunt - after everything else proved OK.
That said, mostly I find such faults confined to cracked carbon resistors.
** Small carbon film resistors regularly fail (open) due to high voltage "tracking" between turns on the spiral cut. Plate resistors in triode stages for one.
IME - metal film and cermet types ( ie chip resistors) are less prone to do the same.
..... Phil
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