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RE: Heaters in series?

The difference in voltage from grid to cathode will be greater in magnitude for the second stage than the first stage.

Fixed bias is called fixed bias because the bias voltage doesn't wander during operation (transitioning from class A to B for example).

If your filament supply has considerable capacitance from each end of the filament to ground, then you may be able to bias up the first stage to several volts, then put fixed bias on the second stage and still run it on the same filament supply without the two stages interfering with each other too much.

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