I prefer to adjust my bias with the amp just idling for a while with all it's covers in place. If the bias circuit is working properly it shouldn't change much at all with changes in temperature. I also try to lay out my boards with the bias pot accessible with the amp assembled, just quickly pop the top cover off and adjust.
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Now it's up and running. All 5ch adjusted and looks to be stable. Around 68mA bias and offset is 0.0-0.2mV. also played music on all 5 and rechecked bias. turned it off for cooling and back on again to recheck bias. all good so far. it starts at around 32mV when cold. And setles back down at 30mV after a short while.
The beast is complete.
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