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ID = 21383
Tube type:  Transmitting Tetrode, air cooled   beam power   VHF 
Identical to 4-400A = E400A = QY4-400 = C1136 = QB4/1100GA = 8438 = CV3879 = PL-4-400A
Similar Tubes
Other shape (e.g. bulb type):
  4-400B ; 4-400C
Normally replaceable-slightly different:

Base OTHER TUBEBASE in general Top contact with a cap
Filament Vf 5 Volts / If 14.1 Ampere / Direct /

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.

Tube prices 0 Tube prices (visible for members only)
Literature Tube Lore, Sibley, USA 1996   

  4-400A: William I. Orr, The Radio Handbook 15th Edition
Götz Linss
4-400A: O.F.
Otto Frosinn

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

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

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

Number of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):4

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