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ID = 13585
United States of America (USA)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Triode, vacuum   Universal 
Identical to 864 = CV2675 = VT-24 = SE-3864A = 264 = CX864 = 464 = ER864 = TS864 = T-864
Similar Tubes
Normally replaceable-slightly different:
  38064 ; FR-300 ; WX12
Predecessor Tubes WD11   UX864  

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 / Specified voltage AC/DC

Low-microphonic rebased and improved WD11; mu 8.2, Gm 0.65mS.

Sturdy non-microphonic tube for aircraft communication. Airplane vibrations caused noise in the receiver using normal tubes. Three of these tubes used in the RCA 4088 condenser microphone. It was classified for industrial use but was released for general distribution in April 1932.

Dimensions (WHD)
incl. pins / tip
x 93 x 30 mm / x 3.66 x 1.18 inch
Weight 32 g / 1.13 oz
Tube prices 3 Tube prices (visible for members only)
Information source Tube Lore (II)   p. 79 & 182
Tube Lore (I)   
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49

171_23.png 864: Telefunken Werkstattbuch
Wolfgang Bauer

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Just Qvigstad
864: RCA
Anonymous 56 Collector

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Usage in Models 1= 1932 ; 3= 1934 ; 1= 1935

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):5

Collection of



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