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7RR3

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ID = 58186
       
Country:
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Developer: Osram-Valves GB (not MO-Valves) 
Tube type:  Transmitting Triode, air cooled   Text 
  <1925 very rare. ***
Identical to 7RR3
Base Wires Wires only.
Was used by Military and/or Government
Filament Vf 15 Volts / If 8 Ampere / Direct / Specified voltage AND current AC/DC
Description 500 watt transmitting tube, first made September 1919 
Information source - - Manufacturers Literature   
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