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The Barretter

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The Philips C2 Baretter.
The Barretter is a current stabilising device used mainly within heater chains to remove fluctuations in mains voltage.
The Barretter is a positive temperature co-efficient resistor. It was formed by placing iron wire within a bulb containing hydrogen. The regulation is appropriate for a defined range of voltages.
See also Current Regulator Tubes.
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