They feature a vacuum tube design with a clear glass enclosure and a black 8-pin octal base. The relays are designed to operate at 115 volts, with the “03” likely indicating a 3-second delay. : Used for sequencing motors, delaying actions, or absorbing initial inrush currents to protect sensitive electronics.
Item Tag: Amperite
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Amperite 22-4 Ballast Tube NOS Current Regulator Radio Voltage Control USA
Harder-to-find Amperite regulators are becoming increasingly scarce—excellent addition to any VinTech inventory. This is a ballast regulator device (thermal resistor), not a conventional vacuum tube.