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ID = 28854
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Developer: General Electric for Brand RCA-Radiotron; Bridgeport CT, Syracuse NY 
Tube type:  Triode, vacuum   Universal 
Identical to UX864 = 464 = SE-3864A = CV2675 = ER864 = 38064 = 264 = CX864 = VT-24 = TS864
Similar Tubes
Normally replaceable-slightly different:
First year 1928 Saga of the Vacuum Tube, Tyne page 328-330
Successor Tubes 864  

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

Sturdy non-microphonic tube for aircraft communication. Airplane vibrations caused noise in the receiver using normal tubes.

The first series of the UX864 tube made in 1928 used the old "shouldered" small UX tube base. Thi9s was replaced by the 30 millimeter UX base in June 1930. This reduced the weight and height of the tube by a few millimeters

Dimensions (WHD)
incl. pins / tip
x 94 x 30 mm / x 3.70 x 1.18 inch
Weight 37 g / 1.31 oz
Information source -- Collector info (Sammler)   
Saga of the Vacuum Tube, Tyne   Pages 328 and 329
UX864: RCA UX864 USA
John Albion

More ...
UX864: Fin Stewart
Fin Stewart


from Just Qvigstad

Usage in Models 3= 1928??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

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