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RE: Phase Inverter Bias Voltage

Use Ohm's law. You can assume the actual bias voltage is a constant, and call it 2 extra volts across the tail resistor. IOW, make the negative rail deeper( more negative voltage) you will have to pass more current. Make it shallower( less negative ) and current through the tail resistor will drop.
cheers,
Douglas

Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

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