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ID = 50355
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Developer: Western Electric Company Inc.; New York (NY) 
Tube type:  Triode, vacuum   Audio Frequency 
Identical to CV1728
Similar Tubes
Normally replaceable-slightly different:

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Was used by Military and/or Government
Filament Vf 10 Volts / If 0.32 Ampere / Indirect / Specified voltage AC/DC

Low-noise audio preamplifier; mu 15, Gm 0.6 to 1.2mS. Silvered pins.
Ultra low-noise variant of 262A, with increased insulation between heater and cathode and internal hum shield. Later production in ST12 bulb.
Also made by STC.

Dimensions (WHD)
incl. pins / tip
x 118 x 38 mm / x 4.65 x 1.50 inch
Weight 36 g / 1.27 oz
Information source Babani, International Radio Tube Encyclopaedia   p. 78 & 79
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   p. 36
-- Original prospect or advert

cv1728_so.png CV1728
Anonymous 10 Collector

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