After the driver tubes have been adjusted,
install the power tubes and adjust them next.
After the driver tubes have been precisely
dialed in, its time to install the power tubes. Let the amp warm
up for a couple minutes then adjust the power tube bias for each channel
to 130mV across the 0.5 ohm resistor as described in the owner's manual.
I let the amp warm up for an hour before making my final adjustment.
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