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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 = SLX240 = TC240 = ER240 = X240 = 240 = RayX-240 = MX240 = CX340 = PA240
Similar Tubes
Normally replaceable-slightly different:
  2969HighMu ; G_CeCo ; PJ-11 ; PT-240
First year Feb.1927 Saga of the Vacuum Tube, Tyne page 317
First Source (s)
1927 : Saga of the Vacuum Tube, Tyne p.317
Predecessor Tubes UX201A   PR-1C  

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 =

Work on this tube began at the GE laboratories in 1923. It was given the type number late in 1926.  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
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   The Story of Electronics Development at the GE Co

uxsockel_13.png UX240: KoBi
Konrad Birkner † 12.08.2014

Just Qvigstad
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

Collection of



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