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G_Moorhead

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ID = 28570
       
Country:
United States of America (USA)
Brand: Moorhead Laboratories (Pacific); San Francisco
Developer: Moorhead Laboratories (Pacific); San Francisco 
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to G_Moorhead = B_BTH
First year 1919 Saga of the Vacuumtube, Tyne page 173

Base Europe 4-Pin (A, 4A, B4, since 1914)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.4 Ampere / Direct / Battery =
Description

Family - according to Tyne: Type A is similar to SE-1444, also with hard vacuum for amplification. Type B is a similar tube, but with a low vacuum for operation as a detector with 18-40 volts on the anode. Type C is similar to Type A, except that the grid is constructed of 22 turns of molybdenum wire with a pitch of 0.3 inch, instead of nickel - and for anode voltages of 80 - 500 volts. Type D is the unbased Electron Relay (ER) previously made by Moorhead. Type E is the British standard Type R, similar to Type A, but with spherical bulb and European standard four-pin base. Type F is similar to Type E, but with a low vacuum like the Type B. Type G is similar to Type C, but has a spherical bulb and an European standard four-pin base. This base was made by the Shaw Insulating Company, which was associated with Moorhead Laboratories. It is the same as the British standard Type B tube.
There are no photos of this tube available and it is assumed that they were made for export to the UK only.

 
Dimensions (WHD)
incl. pins / tip
x 110 x 54 mm / x 4.33 x 2.13 inch
Literature Saga of the Vacuumtube, Tyne   Page 173
- - Manufacturers Literature   
 
b4_1~~74.png
G_Moorhead: Fin Stewart
Fin Stewart

 

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