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ID = 74993
United States of America (USA)
Brand: General Electric Co. (GE); Bridgeport CT, Syracuse NY
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Current Regulator, Iron in Hydrogen   Power-supply 
Identical to B27_GE = UV876 = C376 = 876 = 38276 = 1938 = CV645

Base Edison giant, E40 = 40 mm-Goliat
Was used by Radio/TV-reception etc.
Filament If 1.7 Ampere / Direct

Voltage range 40 - 60 at 1.7 amps. This tube is used in series with the primary of suitably designed transformers to maintain essentially constant input voltage to the primary over a range of line variation of 20 volts. The tube is listed on page 48 of "The Story of Electronic Development at the General Electric Company" dated Dec. 10th, 1930

Dimensions (WHD)
incl. pins / tip
x 196 x 53 mm / x 7.72 x 2.09 inch
Weight 94 g / 3.32 oz
Information source Tube Lore (II)   p. 80 & 211

edison_e40_ballast_tube~~1.png B27_GE: Fin Stewart
Fin Stewart

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