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ID = 13119
United States of America (USA)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to UX240 = 440 = MX240 = CX340 = ER240 = X240 = PA240 = 240 = RayX-240
Similar Tubes
Normally replaceable-slightly different:
  2969HighMu ; G_CeCo
First year Feb.1927 Saga of the Vacuumtube, Tyne page 317
First Source (s)
1927 : Saga of the Vacuumtube, Tyne p.317
Predecessor Tubes UX201A  

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Ha)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =

Announced in February 1927, Tyne page 317. This tube had an amplification factor of 30 - four times that of the UX201A. It was specifically designed for resistance-capacitance coupled amplification. A 250000 ohm coupling resistor was used in the anode circuit.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
45 x 108 x mm / 1.77 x 4.25 x inch
Weight 47 g / 1.66 oz
Literature Taschenbuch zum Röhren-Codex 1948/49   
UX240: Udo Radtke collection
Fin Stewart

UX240: KoBi
Konrad Birkner † 12.08.2014


Usage in Models 1= 1927 ; 1= 1928? ; 3= 1928 ; 1= 1929

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):6

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