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ID = 74758
United States of America (USA)
Brand: DeForest-Tubes
Developer: DeForest-Tubes 
Tube type:  Transmitting Triode, air cooled   Universal 
Identical to Oscillion_500W
Similar Tubes
Different connections:
Successor Tubes 1920   1G  

Base Wires Wires only.
Was used by Transmittertube (Radio)
Filament Direct / Battery =

This tube was designed at the de Forest laboratory in High Bridge, The Bronx New York in the latter part of 1918. It has the anode from a wire lead at one end and the filament and grid leads from the other end. It is entirely tubular in shape but has a widening of the bulb adjacent to the element assembly to allow space for it and also to reduce heat so the bulb would not be damaged. The de Forest type OT200 transmitter used two of these tubes. The tube is illustrated on page 128 of Tyne's "Saga of the Vacuum Tube" and page 129 shows the two tube transmitter. It was replaced by the 1G in 1920

Information source Saga of the Vacuum Tube, Tyne   Pages 128 & 129
Oscillion_500W: Norm Wilson N6JV
Robert Gillespie


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