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ID = 17380
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Transmitting Triode, air cooled   VHF 
Identical to VT-127A = 100TS
Similar Tubes
Normally replaceable-slightly different:
  3-100D2 ; VT-127
Multiple differences or of other kind:
  227A_Eimac ; 227_Eimac
First year 1939 ? -- Collector info (Sammler)
Predecessor Tubes VT-127  

Base SPECIAL TUBEBASE in general (Codex=sp)
Was used by Radar
Filament Vf 5 Volts / If 10.5 Ampere / Direct

VHF transmitting triode with 100 Watt dissipation rating, designed just before WW2. Electrode structure similar to 100TL (of Eitel-McCullough), with bigger filament. All glass body with two plate side pins near the top, two grid side pins near the center and two filament pins from the bottom. Pulse rated at higher frequency than 100TL.
16 tubes used as ring oscillator at 205 MHz in SCR-268 searchlight director.
Productions reported by Eimac, Heintz & Kaufman, Westinghouse, Sylvania and Industrial & Commercial Electronics.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
100 x 138 x 68 mm / 3.94 x 5.43 x 2.68 inch
Weight 80 g / 2.82 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore (I)   
VT-127A: Sammlung EE
Ernst Erb

VT-127A: ARRL Handbook 1972
Michael Schlör


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