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ID = 21397
United States of America (USA)
Developer: Eimac (brand name) 
Tube type:  Beam Power Tube   beam power   VHF 
Identical to 8438 = 4-400A = QB4/1100GA = CV3879
Similar Tubes
Normally replaceable-slightly different:

Base SPECIAL TUBEBASE in general Top contact with a cap.
Was used by Transmittertube (Radio)
Filament Vf 5 Volts / If 14.1 Ampere / Direct
Dimensions (WHD)
incl. pins / tip
x 150 x 87 mm / x 5.91 x 3.43 inch
Weight 190 g / 6.70 oz
Information source - - Manufacturers Literature   Valvo, Senderöhren, 1983
Tube Lore (II)   p. 110
8438: O.F.
Otto Frosinn

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8438: Valvo,Senderöhren, 1983
Anonymous 15 Collector

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8438: Valvo,Senderöhren, 1983
Anonymous 15 Collector

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