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An iron-hydrogen resistor consists of a hydrogen-filled glass bulb like a light bulb, in which an iron wire is located.
Early technologies included iron-hydrogen resistors, resonant transformers, nonlinear resistors, loading resistors, neon stabiliser tubes, vibrating contact regulators etc.
Iron-hydrogen resistors were used in the early vacuum tube systems in series with the heaters of electron tubes to stabilize the heater circuit current against fluctuating supply voltage.