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HF_red_ring

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ID = 30827
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   RF/IF-Stage 
Identical to HF_red_ring
Similar Tubes
Heater different:
  HF_double_red_D06 ; HF_double_red_D3
First Source (s)
1924 : Saga of the Vacuum Tube, Tyne p.378
1924 : British Radio Valves - The Vintage Years: 1904-1925 p.36 & 118
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.6 Ampere / Direct / Battery =
b4_base_pins~~79.png HF_red_ring: Fin Stewart
Fin Stewart

Just Qvigstad

Collection of

Rudolf Osterkamp (D)
 
mullard_hf1red_ring_bild2.jpg

 
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