(!) (Best Single) 393A GE made for WE NOS 1940's original box, strong output (64/40)

393A GE made for Western Electric NOS 1940's original box, strong output

64/40

(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)