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NVD3

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ID = 53902
       
Country:
Denmark
Brand: Audiola, Nordisk Solar Industri A/S; Kolding
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
  Ca. 1925 up to 1945 rare.
Identical to NVD3 = 506
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Direct
Description At the end of 1920's or early 1930's the Nordisk Solar Co. sold Philips tubes under the Audiola brand name. At least there is a tube with a label at the base with the text: Audiola, type HVD3, a/s Nordisk Solar Co. At the top of the glass is printed: Philips, 506, Miniwatt. 
Dimensions (WHD)
incl. pins / tip		 50 x 116 x 35 mm / 1.97 x 4.57 x 1.38 inch
Information source - - Data from my own collection   
17_46~~8.png NVD3: Fin Stewart
Fin Stewart

Just Qvigstad 		506data.png
NVD3: own collection
Peter den Boer

Collection of

Peter den Boer (NL)
 
audiolanvd3is506.jpg

 
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