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ARDE_HF

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ID = 28991
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Ediswan, Siemens Edison Swan Electric Co.; London 
Tube type:  Triode, vacuum   RF/IF-Stage 
  <1925 very rare. ***
Identical to ARDE_HF
Similar Tubes
Normally replaceable-slightly different:
  ARDE
First year 1923 Saga of the Vacuum Tube, Tyne page 373
First Source (s)
1925 : 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 1.8 Volts / If 0.3 Ampere / Direct / Battery =
Description

First made in 1924, this tube has a red stripe painted on the side of the glass, from the base to the tip. This indicates that the tube is for High Frequency use. The stripe measures about 3 mm wide and over time, in many cases, the stripe has worn off..

 
Dimensions (WHD)
incl. pins / tip		 x 110 x 31 mm / x 4.33 x 1.22 inch
Weight 47 g / 1.66 oz
Information source British Radio Valves - The Vintage Years: 1904-1925   p. 50, 87 & 115
b4_base_pins~~217.png ARDE_HF: Fin Stewart
Fin Stewart

Just Qvigstad 		ardehf_spec.png
ARDE_HF: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

Collection of

Geri Meier (CH)
 
ardeediswan1_klein_klein.jpg

ARDE_HF
 
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