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D_Moorhead

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ID = 28985
       
Country:
United States of America (USA)
Brand: Moorhead Laboratories (Pacific); San Francisco
Tube type:  Gas Triode   Detector 
  <1925 very rare. ***
Identical to D_Moorhead
Similar Tubes
Normally replaceable-slightly different:
  ER_Moorhead
First year 1919 Saga of the Vacuumtube, Tyne page 172

Base Wires Wires only
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / 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. It is the same as the British standard Type B tube.

 
Text in other languages (may differ)
Literature Saga of the Vacuumtube, Tyne   page 172
 
moor_er20.jpg
D_Moorhead: Bill Condon collection, with kind permission of Mrs V Condon
Fin Stewart

 

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