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That board has 3 bias circuits, one for the input stage and one for each output stage.

Those are the voltage regulators.

If memory serves the tracking is below the board near the finals, he gouged tracks in the heat sink to route the wiring for that.

[QUOTE="mackmobile43, post: 165039, member: 6232"] That board has 3 bias circuits, one for the input stage and one for each output stage. Those are the voltage regulators. If memory serves the tracking is below the board near the finals, he gouged tracks in the heat sink to route the wiring for that. [/QUOTE]

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