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ID = 21345
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Transmitting Tetrode, air cooled 
Identical to 4-125A = 4D21 = QB3/300GA = PL-4D21
Similar Tubes
Normally replaceable-slightly different:

Base TRANSMITTER-Base in gneral Top contact with a cap
Filament Vf 5 Volts / If 6.5 Ampere / Direct
Description 5-pin jumbo base 
Tube prices 2 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
  4-125A: Eimac Katalog 19848
Arpad Roth † 27.3.17
4-125A: K.H.Fischer
Karlheinz Fischer

4-125A: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

4-125A: Valvo,Senderöhren, 1983
Anonymous 15 Collector

Usage in Models 1= 1946

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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