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ID = 28745
United States of America (USA)
Brand: DeForest-Tubes
Developer: DeForest-Tubes 
Tube type:  Transmitting Triode, air cooled   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to RO
First year 1927 ?? Saga of the Vacuumtube, Tyne page 302, 304
First Source (s)
1926 : Saga of the Vacuumtube, Tyne p.301,302 & 304

Base TRANSMITTER-Base in gneral Top contact with a cap
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 3.6 Ampere / Direct / Parallel, (AC/DC)

This tube was rated at 300 watts input and could operate with 2500 volts on the anode. The filament was "Long Life" tantalum

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