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ID = 49550
United States of America (USA)
Brand: Moorhead Laboratories (Pacific); San Francisco
Developer: Moorhead Laboratories (Pacific); San Francisco 
Tube type:  Gas Triode   Detector 
  <1925 rare.
Identical to B_Moorhead-Shaw = VT-Class-I = TypeB
Similar Tubes
Other base:
First year 1919 Saga of the Vacuum Tube, Tyne page 172
Predecessor Tubes VT-1  

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.7 Ampere / Direct / Battery =

Information from www This sample of the B power tube is unmarked and has a Shaw base. This tube may have been an electrical prototype of the British B fitted with an American base for ease of testing. This base was made by the Shaw Insulating Company, which was associated with Moorhead Laboratories

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.

Dimensions (WHD)
incl. pins / tip
44 x 102 x 35 mm / 1.73 x 4.02 x 1.38 inch
Information source Saga of the Vacuum Tube, Tyne   Pages 146, 170-175, 178, 300 & 331
B_Moorhead-Shaw: Bill Condon collection, with kind permission of Mrs V Condon
Fin Stewart

B_Moorhead-Shaw: own collection
Peter den Boer


from Just Qvigstad

Usage in Models 2= 1919? ; 16= 1919 ; 1= 1920?? ; 2= 1920? ; 46= 1920 ; 17= 1921 ; 3= 1922

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):87

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