Amperite 7H-4B NOS 1952

75,38 NOK

Model/Product no.: 18539

Weight: 0,1 kg

Stock status: In stock

The Amperite 7H-4B is a vintage automatic current regulator (also known as a ballast tube or resistor) designed to maintain a constant current within a circuit. It is a type of vacuum tube component commonly used in older electronic devices, such as vintage radios and jukeboxes.

Description
- Function: The device uses a resistance wire with a positive temperature coefficient of resistance, sealed in a bulb filled with hydrogen or helium gas, to automatically adjust its resistance to keep the current flow stable despite changes in input voltage.
- Design: It is a glass tube designed to plug into a standard radio octal 8-pin socket, similar to a vacuum tube, allowing it to be easily changed for maintenance.
- Durability: The 7H-4B is hermetically sealed, making it unaffected by altitude or humidity changes and rugged enough to withstand vibration.
- Operation: It operates on both AC and DC current.
- Applications: It was primarily used in applications requiring a stable current supply, such as in the heater circuits of some vacuum tube radios to protect the filaments from voltage fluctuations.

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