The run in or burn in is largely permanent, but most gear does need to take time to stabilize at running temp. There are various reasons for this, some of them speculative - some of them known quantities.
Specifically amplifiers tend to require this, depending on the given design. This is due to bias and crossover stabilization at their ’operating temperatures’.
Specifically amplifiers tend to require this, depending on the given design. This is due to bias and crossover stabilization at their ’operating temperatures’.