393A GE made for WE test like new 1940”s (62/40)

393A GE made for WE test like new 1940”s reboxed

62/40

similar specs to 3C23, 7410, but 393A has octal base (8 pins)

3C23 has 5 pin base

2.5Vfil @ 7A, peak anode to grid volate = 1250

ST-16 bulb