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ID = 31405
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to TY4-350
Similar Tubes
Normally replaceable-slightly different:
  833A ; ES833A

Base TRANSMITTING & Power-TUBES/VALVES in gen 2 Top contacts.
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 10 Ampere / Direct

Pa <400W with forced air cooling, 300W natural.

Dimensions (WHD)
incl. pins / tip
117 x 220 x mm / 4.61 x 8.66 x inch
Weight 545 g / 19.22 oz
Information source - - Manufacturers Literature   
Tube Lore (II)   p. 78
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
TY4-350: Mullard-original papers
Otto Galli

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