393A GE made for WE tests like new 1940”s, tilted top plate (62/40)

393A GE made for WE tests like new 1940”s, strong output, very small hairline crack in base

top plate tilted, but doesn”t effect tube performance

62/40

(similar specs to 3C23, 7410, but 393A has octal base, 3C23 has 5 pin base)

(2.5Vfil @ 7A, peak anode to grid volate = 1250, ST-16 bulb)