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ID = 28398
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Ediswan, Siemens Edison Swan Electric Co.; London 
Tube type:  Triode, vacuum   Universal 
  <1925 rare.
Identical to ARDE
Similar Tubes
Normally replaceable-slightly different:
First year 1923 Saga of the Vacuum Tube, Tyne Seite 373
First Source (s)
1923 : History of the British Radio Valve to 1940 p. 158

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.3 Ampere / Direct / Battery =

Neg, grid voltage = 1, Ra = 27.0 kOhm, slope = 0.30 mA/V, amplification = 9.0. See also the more specialised ARDE_HF and ARDE_LF

Dimensions (WHD)
incl. pins / tip
31 x 110 x mm / 1.22 x 4.33 x inch
Weight 47 g / 1.66 oz
Information source - - Manufacturers Literature   1924
British Radio Valves - The Vintage Years: 1904-1925   Pages 50, 87 & 115
Saga of the Vacuum Tube, Tyne

b4_base_pins~~216.png ARDE: Fin Stewart
Fin Stewart

Just Qvigstad
ARDE: Herstellerinfo
Anonymous 15 Collector

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