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ID = 28911
United States of America (USA)
Brand: Moorhead Laboratories (Pacific); San Francisco
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to R_Moorhead
Similar Tubes
Other shape (e.g. bulb type):
  R_Moorhead_H ; VT32_Moorhead
First year 1917 ?? Saga of the Vacuum Tube, Tyne page 170, 171
Predecessor Tubes ER_Moorhead-Edison  
Successor Tubes VT32_Moorhead   R_Moorhead_H  

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 =

Operated at 4 volts the tube has a life of 800 hours. The R was supplied to the British Army and was a general purpose vacuum triode similar in design to the French TM and to the British R. In the early productions the Moorhead tube used a spherical bulb and a vertical plate assembly, while the British R used a horizontal plate structure. The tube is fitted with a base made by the Shaw Insulator Company, who were associated with Moorhead Laboratories

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
54 x 109 x 28 mm / 2.13 x 4.29 x 1.10 inch
Weight 41 g / 1.45 oz
Tube prices 2 Tube prices (visible for members only)

b4~~1.gif R_Moorhead: KoBi
Konrad Birkner † 12.08.2014

Just Qvigstad

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