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ID = 6876
United States of America (USA)
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Half-Wave Mercury-Vapor Rectifier   Power-supply 
Identical to 871 = SE-4102 = UE-971 = WL-402
Similar Tubes
Normally replaceable-slightly different:

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Br) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2.5 Volts / If 2 Ampere / Direct / Specified voltage AC/DC

5KV PIV, 125mA average. T9 bulb (28 mm diameter). This tube is designed for use in television sets of the mid 1930's. It was made by RCA, Hytron. Tung-Sol and United (UE-971). The Hytron bulb was an ST14 size (45 mm diameter). A drawing of the tube in the 1933 Lafayette Radio catalog shows the tube having an S14 bulb but this type has not been located so far. Please refer to the RCA data sheet dated January 15th, 1937 for more information. This is a very rare tube.

Dimensions (WHD)
incl. pins / tip
x 127 x 28 mm / x 5.00 x 1.10 inch
Information source Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore (I)   Also TL-(II), p. 80
Lafayette Radio Catalog
- - Manufacturers Literature

871_sock.png 871: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

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Just Qvigstad
871: RCA TT
Götz Linss † 27.06.21

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