I had the same thing happen... QMX+ is on the bench with the BS170's removed, and one of them indeed tested bad. While waiting on my replacement BS170's I am carefully cleaning out the holes. I really don't want to deal with this again.
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Would reducing the operating voltage during the calibration help prevent it again? Does the calibration depend on the actual voltage used to be accurate. I normally operate at 12V with a low dropout precision regulator. If I calibrated at, say, 9V, would the calibration be accurate for use at the normal 12V?
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Just thinking out loud...trying hard not to do a second transistor transplant. Not sure the patient would survive lol...
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73,
Joel W9JFK
