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ID = 15078
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Triode, vacuum   Universal 
  Ca. 1925 up to 1945 very rare. ***
Identical to WX12 = 4612_WLS = X12 = SLD12 = CX12
Similar Tubes
Normally replaceable-slightly different:
  2953 ; 4615 ; 864
Other class quality (otherwise equal):
Other base:
  11 ; 12 ; C11 ; C12_Triode ; V.T.12 ; WD11 ; WD12
First year 1925 Radios von gestern, 2. Auflage
Predecessor Tubes WD11   12   WD12  
Successor Tubes CX12  

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bo)
Was used by Radio/TV-reception etc.
Filament Vf 1.1 Volts / If 0.25 Ampere / Direct / Battery =

Ua = 90 V; Ia = 2,5 mA; Ug1 = -4,5 V; Ra = 15,5 kOhm; S 0,425 mA/V V = 6,6

Dimensions (WHD)
incl. pins / tip
35 x 104 x 30 mm / 1.38 x 4.09 x 1.18 inch
Weight 42 g / 1.48 oz
Information source Tube Lore (II)   p. 25
Saga of the Vacuum Tube, Tyne   Page 313
-- Collector info (Sammler)
Taschenbuch zum Röhren-Codex 1948/49

uxsockel_18.png WX12: KoBi
Konrad Birkner † 12.08.2014

Just Qvigstad
WX12: Raytheon Databook 1937
Emilio Ciardiello

More ...
Usage in Models 1= 1924 ; 1= 1926

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

Collection of



Forum contributions about this tube
Threads: 1 | Posts: 2
Hits: 2648     Replies: 1
WX12 (WX12)
Norman Bourassa

I would just like to point out that the 864 tube is often used as a substitute for the WX12 tube.  the differences between the WX12 and 864 are very small, but the WX12 is in much shorter supply than the 864.  Therefore, it is generally much cheaper to use an 864 tube in place of a WX12.  I am not sure why these two tubes are not shown as substitutes for one another on this website.   

Konrad Birkner † 12.08.2014

nN wonder, the substitution was not yet shown since nobody had us informed yet!

You are the first, and consequently I checked and introduced the cross reference.

We are building up from the info brought in by the members.

Anyway: Thanks for the hint!

End of forum contributions about this tube

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