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ID = 51399
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode, vacuum 
  Ca. 1925 up to 1945 rare.
Identical to A425_UX
Similar Tubes
Other base:
First Source (s)
1925 : Saga of the Vacuum Tube, Tyne p.421

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.06 Ampere / Direct / Battery =
Description Also available with B4 base. HF and LF amplification, resister coupling. Als to be used as detector. 
Dimensions (WHD)
incl. pins / tip
41 x 94 x 35 mm / 1.61 x 3.70 x 1.38 inch
Weight 36 g / 1.27 oz
Information source -- Collector info (Sammler)   
- - Manufacturers Literature   Rif-26 Philips Australia
Peter den Boer

Stuart Irwin

A425_UX: own collection
Peter den Boer

from Just Qvigstad

Usage in Models 1= 1926? ; 1= 1928

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

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