1 NOS 50A1 Ballast Tube - Current Regulation for Zenith 600 TransOceanic Radios
The scarce 50A1 tube is designed for the 600 series Zenith TransOceanic Radios. 1 NOS Zenith 50A1 Current Regulator Tube. Make sure you have a healthy working radio before installing this 50A1 tube.