A voltage-regulator tube, also known as a gas discharge tube or voltage regulator tube, is a type of electronic component used to maintain a constant voltage level in an electrical circuit. These tubes were more commonly used before the widespread adoption of solid-state voltage regulators. ### Key Characteristics: 1. **Construction**: Voltage-regulator tubes typically consist of a sealed glass envelope containing a low-pressure gas or vapor. The tube has electrodes that allow electric current to flow.
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