Discussion
Why is the bias spreader mounted on the output heatsink?
Answer: B
The output devices' base-emitter drops fall about two millivolts per degree as they heat, so unless the spreader falls with them the quiescent current climbs and can run away. Thermal coupling makes the compensation automatic. The spreader dissipates very little, insulation is a separate matter, and capacitance is not the issue. Compensating a temperature-dependent quantity with an identical device at the same temperature works only if the two really do share a temperature.
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