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RA_Mullard

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ID = 28658
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Universal 
Identical to RA_Mullard
Similar Tubes
Normally replaceable-slightly different:
  R_BTH ; R_England ; R_Marconi ; R_Osram
First year 1923 ? 70 Years of Radiotubes and V.
First Source (s)
1921 : British Radio Valves - The Vintage Years: 1904-1925 p.36 118
1923 : Saga of the Vacuum Tube, Tyne page 378
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.7 Ampere / Direct / Battery =
Description

R-type with spherical bulb.

 
Dimensions (WHD)
incl. pins / tip		 x 118 x 55 mm / x 4.65 x 2.17 inch
Weight 52 g / 1.83 oz
Information source History of the British Radio Valve to 1940   P. 156
b4_base_pins~~60.png RA_Mullard: Fin Stewart
Fin Stewart

Just Qvigstad 		ra_mullard_spec.png
RA_Mullard: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector
 
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