The 1B46 is a miniature voltage stabiliser with an operating voltage of 85 Volts designed to operate at about 1.5 mA. This would feed a low power oscillator.
The maker's name, Made in USA and the locating pin of the bayonet base.
The two concentric electrodes seen through the end window.
The miniature bayonet base.
The thin glass tube envelope is 14 mm in diameter and, including the Peanut base pins, is 42 mm tall.
Reference: Data-sheet. Type 1B46 was first introduced in 1945. See also1945 adverts.
