A grid-leak detector is a type of electronic circuit used primarily in radio and audio equipment to detect small currents, typically resulting from a leakage path in high-impedance circuits, such as those found in vacuum tube amplifiers. These detectors can help identify problems such as capacitor leaks or other issues that might cause unwanted current flow. The term "grid-leak" originates from vacuum tube technology, where the control element of a vacuum tube is referred to as the "grid.
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