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ID = 21383
Developer: Eimac (brand name) 
Tube type:  Transmitting Tetrode, air cooled   beam power   VHF 
Identical to 4-400A = QB4/1100GA = 8438 = E400A = QY4-400 = C1136 = CV3879 = PL-4-400A
Similar Tubes
Other shape (e.g. bulb type):
  4-400B ; 4-400C
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 / Specified voltage AC/DC

The differences between the A and B versions are not clear, but probably the all-glass version B was made by Amperex as derivative of European Philips production.

Dimensions (WHD)
incl. pins / tip
x 150 x 87 mm / x 5.91 x 3.43 inch
Weight 190 g / 6.70 oz
Tube prices 1 Tube prices (visible for members only)
Information source Tube Lore (I)   
-- Collector info (Sammler)
  4-400A: William I. Orr, The Radio Handbook 15th Edition
Götz Linss
4-400A: O.F.
Otto Frosinn

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4-400A: Valvo,Senderöhren, 1983
Anonymous 15 Collector

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4-400A: Valvo,Senderöhren, 1983
Anonymous 15 Collector

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Usage in Models 2= 1956 ; 1= 1957?? ; 1= 1959? ; 1= 1960??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):5

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