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DG_Mullard

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ID = 28512
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Space Charge Tetrode   Audio Frequency 
Identical to DG_Mullard
Similar Tubes
Heater different:
  DEDG
First year 1924 Saga of the Vacuum Tube, Tyne Seite 378
First Source (s)
1924 : British Radio Valves - The Vintage Years: 1904-1925 p.65 &124
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Sidecontact.
Was used by Radio/TV-reception etc.
Filament Vf 3.8 Volts / If 0.65 Ampere / Direct / Battery =
Description

Inner grid lead brought out to the metal shell. 

 
b4_tetrode~~10.gif DG_Mullard: Fin Stewart
Fin Stewart

Just Qvigstad 		dg_mullard_spec.png
DG_Mullard: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector
 
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