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C_Moorhead

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ID = 28983
       
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 C_Moorhead
Similar Tubes
Other class quality (otherwise equal):
  TT_Moorhead
First year 1919 Saga of the Vacuumtube, Tyne page 172, 176

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Radio/TV-reception etc.
Filament Vf 5 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. It is the same as the British standard Type B tube.
The base used on this tube was made by the Shaw Insulator Company, an associate of Moorhesd laboratories

 
Text in other languages (may differ)
Literature Saga of the Vacuumtube, Tyne   page 172, 176
 
moor_c.jpg
C_Moorhead: Bill Condon collection, with kind permission of Mrs V Condon
Fin Stewart

 
uv~~23.png
C_Moorhead: Fin Stewart
Fin Stewart

 

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