The G150/2D is a low power gas filled triode or thyratron.
Unlike our other G150/2D this exhibit is of the older style with a metal skirt containing the base connections rather than a Bakelite base cap.
The KB/F identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the F identifies the maker as STC, Paignton.
The commercial Type designation on the left and the CV identification on the right. The central tube shields one electrode and the dome is the other main electrode.
The CV413 and KB/F.
Here the three electrodes can be seen: the central rod anode with the two annular electrodes sitting part way down the central glass tube. The inner ring is the trigger and the outer ring is the cathode.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 62 mm tall.
References: Data-sheet & 1040. Type G150/2D was first introduced in 1958. See also1958 adverts.
