volt regulator, octal base, aka VR-150 Other cold-cathode tubes 0A4G Gas triode 0Y4 Half-wave gas rectifier 0Z4 Full-wave gas rectifier, octal base. Widely used in vibrator power supplies in early automobile radio receivers. 1 volt heater/filament tubes Tubes with 1.0 to 1.4 volt heaters 1A3 High frequency diode with indirectly heated