c battery
Definition
Noun: A C battery is a type of battery historically used in electronic devices, particularly in vacuum tube circuits, to provide a steady negative bias voltage to the control grid of the tube. Its primary function was to maintain the correct electrical potential (grid bias) for proper operation, not to power the main functions of the device.
Usage
The term C battery is specific to older electronics and is not commonly used for modern batteries. It refers to its distinct role within a circuit. * In early radios, the C battery was essential for controlling the amplification of the vacuum tubes. * The technician replaced the depleted C battery to restore proper bias to the amplifier stage.
Advanced Usage
- Technical Context: In vintage electronics restoration, ensuring the correct voltage from the C battery is crucial for circuit stability and to prevent distortion.
- The schematic indicates a 4.5-volt C battery for grid bias.
Variants and Related Words
- A battery: The battery used to heat the filament (cathode) of a vacuum tube.
- B battery: The high-voltage battery used to supply the plate (anode) current in a vacuum tube circuit.
- Grid bias battery: A more descriptive synonym for a C battery, directly stating its function.
Synonyms
- Grid bias battery
- Bias battery
Notes on Different Meanings
- Modern Misinterpretation: In contemporary, non-technical language, "C battery" is sometimes incorrectly used to refer to a standard cylindrical battery of a certain physical size (e.g., IEC designation R14). This is a different, size-based classification (C-size battery) and is unrelated to the historical electronic function of a C battery for vacuum tube bias.
Noun
-
battery used to maintain the grid potential in a vacuum tube
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