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ID = 39616
United States of America (USA)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to 38111
Similar Tubes
Normally replaceable-slightly different:
Predecessor Tubes 211  

Base Jumbo 4-pin bayonet (1918)
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 3.4 Ampere / Direct / Specified voltage AC/DC

Transmitting triode. Low-capacitance version of 211. For Xtal controlled oscillators.

As well sold as CF38111 (“CF” is the prefix for De Forest). CF38111 are “late” (ca. 1930-1932) type 211 tubes made for the US Navy.
[Info from Jim Cross, 07. Sept. 2022]

Information source Tube Lore (I)   
Tube Lore (II)   p. 182

vt4c_22.png 38111: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad

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