I'm working on a project using some IV-17 tubes, and I cam across something I need advice on. The datasheets I've found say that the filament current is 47 mA at 2.4 Vac, so an effective resistance of about 51 Ohms. But on 3 tubes I've measured, they're all about 20 Ohms. Does the filament resistance change when hot? Because that seems like a huge difference...
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