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PV2_Ediswan

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ID = 28860
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Ediswan, Siemens Edison Swan Electric Co.; London 
Tube type:  Triode, vacuum   Power/Output 
  <1925 rare.
Identical to PV2_Ediswan
First year 1924 ? 70 Years of Radiotubes and V. p241
First Source (s)
1924 : British Radio Valves - The Vintage Years: 1904-1925 pp,31, 32, 115
1924 : History of the British Radio Valve to 1940 p. 115
Successor Tubes PV2_DE  
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 6 Volts / If 1.5 Ampere / Direct / Battery =
Description

Bright emitter. Not to be confused with completely different Dull Emitter PV2, here in RMorg as PV2_DE.
Thrower depicts a globe bulb. There is also a variant with a tapered bulb. The "pinch" in the globe shaped bulb is flat while in the tapered bulb it is of a four cornered "X design.

 
Information source Saga of the Vacuum Tube, Tyne   p.373
70 Years of Radiotubes and V.   p. 192
British Radio Valves - The Classic Years: 1926-1946
b4_base_pins~~227.png PV2_Ediswan: Fin Stewart
Fin Stewart

Just Qvigstad 		pv2.gif
PV2_Ediswan: Aus eigenen Unterlagen
Rudolf Osterkamp

Collection of

Konrad Birkner † 12.08.2014 (D)
 
pv2.jpg

 

Variants

this tapered variant is not mentioned in Thrower.
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