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ID = 16543
United States of America (USA)
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Triode, vacuum   Power/Output 
Identical to UX231 = CX331 = PH231 = 431 = ER31 = SX231 = 231 = 131 = ER231 = C-231 = NU-31 = RYB231 = NX-231
Similar Tubes
Normally replaceable-slightly different:

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.13 Ampere / Direct / Battery =
Description Originally made with the T9 (30 mm diameter) glass bulb, this tube was made from early 1931 with the S12 bulb (38 mm diameter) and generally branded type 31 only. A year later the bulb size was changed to ST12. the weight increased by 2 grams. Most US manufacturers still making the tube adopted the changes as a natural progression. 
Dimensions (WHD)
incl. pins / tip
x 93 x 30 mm / x 3.66 x 1.18 inch
Weight 32 g / 1.13 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
Saga of the Vacuum Tube, Tyne   Page 330
-- Collector info (Sammler)

uxsockel_11~~60.png UX231: Fin Stewart
Fin Stewart

Just Qvigstad
Usage in Models 4= 1930 ; 5= 1931 ; 1= 1932

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):10

Collection of



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