I am interested in building a IV-11 clock from scratch, and have Maxim 1771s, inductors around 1000 uH, and IRFD220s on hand but am open to ordering whatever parts I need. I'm most interested in solutions for generating the grid voltage, but ideally am looking for a nice circuit for both grid and filament.
But it is true that you and drive the filament with DC but you get a brightness gradient across tubes in series or long multisegment VFDs? I've never seen how severe the gradient is. The anode/grid voltage can be generated with a simple power supply by selecting the transformer voltage correctly.
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