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ID = 74746
United States of America (USA)
Brand: DeForest-Tubes
Developer: DeForest-Tubes 
Tube type:  Triode, vacuum   Audio Frequency 
Identical to Audion_glass-arbors

Base Edison (candelabra) 12 mm Other combinations of connections.
Was used by Radio/TV-reception etc.
Filament Direct / Battery =

This tube was made by the de Forest company at the new works at High Bridge in The Bronx, New York City. De Forest hired Robert F. McGowan as chief engineer and in this role, he supervised development of various new tubes as well as the manufacture of some tubes formerly made by H. W. McCandless & Co. This tube's appearance was that of a conventional twin element Audion but it had glass arbors to help protect the anode and grid from damage due to rough handling. It had two tantalum filaments with the lead for the second filament insulated from the brass base with the usual stout rubber band. It was to the basis of the first tubes made by Western Electric.

Dimensions (WHD)
incl. pins / tip
x 54 x mm / x 2.13 x inch
Information source Saga of the Vacuum Tube, Tyne   Pages 118 & 119

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