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ID = 17217
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Tube type:  Transmitting Triode, air cooled 
  <1925 very rare. ***
Identical to NT1 = T1 = CV1203 = 4869
First year May.1917 - - Data from my own collection

Filament Vf 15 Volts / If 4.7 Ampere / Direct
Description The naval name for the T1. Based on a theoretical Admiralty design and manufactured by the Osram-Robertson lamp works.
NT1: Manufacturer's Literature
Emilio Ciardiello

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