Discussion
An oscillator drifts steadily upward in frequency for ten minutes after switch-on. What is happening?
Answer: B
A drift over minutes in one direction is thermal: self-heating and the enclosure warming change the reactive components until temperatures stabilise. Amplitude loops settle in a fraction of a second and regulators in milliseconds, and ageing acts over months rather than minutes. The time scale of a symptom identifies its mechanism more reliably than anything else, and ten minutes is unambiguously thermal.
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