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ID = 31393
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Transmitting Tetrode, air cooled   VHF 
Identical to QV2-350F = 4CX350F
Similar Tubes
Heater different:
  4CX350A ; QV2-350A

Base SPECIAL TUBEBASE in general Top contact with a cap.
Filament Vf 26.5 Volts / If 0.73 Ampere / Indirect / Specified voltage AC/DC
Description Pa <250W,
(Also made by Mullard with the name 4CX360F) 
Weight 113 g / 3.99 oz
Information source - - Manufacturers Literature   
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qv2350f_so1.png QV2-350F: ARRL Handbook 1972
Anonymous 10 Collector

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QV2-350F: Manufacturer's Literature
Emilio Ciardiello

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