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ID = 56546
United States of America (USA)
Brand: Marconi Wireless Telegraph Co. of America
Developer: Moorhead Laboratories (Pacific); San Francisco 
Tube type:  Gas Triode   Detector 
  <1925 rare.
Identical to ER_Marconi = ER_Moorhead

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 =

The base of this tube was made by the Shaw Insulator Company, which was associated with Moorhead Laboratories. Anode 18-40 Volt

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 173 & 174

2a_uv4~~3.png ER_Marconi: own collection
Peter den Boer

Just Qvigstad

Collection of



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