PX4, OSRAM, TALL COKE BOTTLE SHAPE,, PP3/250, AC044, PX4

PX4, OSRAM, CHROME PLATE, PP3/250, AC044, PX4

This ST shaped example of Mazda's iteration of the classic PX4 shows good emission with all filaments strung and lit:-

Ia =  84 mA

gm = 4.4 mA/V