Do I understand correctly, that they work just like a resistor? My plan is to drive IV-6 filament by directly PWMing it from 5V or 3,3V. It normally requires 50mA@1V, so if the filament works just like a resistor, can I PWM it with low duty cycle (4% on 5V and 9,2% on 3,3V)? Of course PWM frequency will be something above 25kHz to avoid any noise. Will the wire burn from short current spikes? I don't like the idea of adding a dropper resistor. on 5V I will be losing 4x the power needed to warm the cathodes! Another idea is to connect 4 tubes in series. Of course it will make a voltage gradient across tubes, but I plan to drive anodes at 50+V, so maybe it won't be visible - does anybody have any experience with driving filaments like that? A step-down converter sounds good, but I will be very space limited in this project.
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