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RE: This might be close.

Rather than "regulating" the bias supply, just change a resistor or two to get the voltage into range. Better to have the bias, plate and screen voltages change together with line voltage - if bias voltage is truly fixed, dissipation and operating point vary with supply voltage. They'll "track" if all are left unregulated (regulate screen and grid voltages and it will be even better, but that gets complicated...)

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