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ID = 68915
United States of America (USA)
Brand: Moorhead Laboratories (Pacific); San Francisco
Developer: Moorhead Laboratories (Pacific); San Francisco 
Tube type:  Triode, vacuum   Text 
  <1925 very rare. ***
Identical to TT_Moorhead
Similar Tubes
Other class quality (otherwise equal):

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Radio/TV-reception etc.
Filament Vf 6 Volts / If 0.85 Ampere / Direct / Battery =

The Moorhead TT tube is a low power transmitting type which operates with 500 volts on the anode. It is similar to the Moorhead C but has an eleven turn grid, instead of the twenty two turns as in the C tube. The grid is made of molybdenum in accordance with British Government specifications. It has a Shaw base made by the Shaw Insulator Company, which was associated with Moorhead laboratories. Literature states that this tube has been developed as an undamped wave transmitter for the amateur. The tube was made for two years from early May, 1920.

Dimensions (WHD)
incl. pins / tip
x 106 x 44 mm / x 4.17 x 1.73 inch
Information source -- Collector info (Sammler)   
- - Manufacturers Literature   Brochure May 1920
TT_Moorhead: Bill Condon collection, with kind permission of Mrs V Condon
Fin Stewart

TT_Moorhead: Fin Stewart
Fin Stewart


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