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ID = 21346
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Transmitting Tetrode, air cooled 
Identical to 4-250A = QB3,5/750GA = 5D22 = PL-5D22
Similar Tubes
Normally replaceable-slightly different:
First Source (s)
15.Nov.1948 : - - Manufacturers Literature

Base Giant 5 pin metal shield (B5E) Top contact with a cap.
Filament Vf 5 Volts / If 14.5 Ampere / Direct / Parallel, (AC/DC)
Dimensions (WHD)
incl. pins / tip
90 x 156 x mm / 3.54 x 6.14 x inch
Tube prices 2 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
  4-250A: ARRL The Radio Amateur's Handbook 1950
Götz Linss
4-250A: John paulsen
Karlheinz Fischer

4-250A: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

4-250A: Valvo,Senderöhren, 1983
Anonymous 15 Collector

from Just Qvigstad

Usage in Models 1= 1950 ; 1= 1954?? ; 1= 1956 ; 1= 1965?

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

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