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ID = 21907
Tube type:  Transmitting Tetrode, air cooled 
Identical to 6155 = QY3-125 = CV2130 = QB3/300 = RS1007
Similar Tubes
Normally replaceable-slightly different:
  4-125A ; 4D21
First Source (s)
04.Sep.1953 : Electron Tube Registration List 1230

Base Giant 5 pin (ESEC B5F) Top contact with a cap.
Filament Vf 5 Volts / If 6.5 Ampere / Direct

Similar to 4D21; removed skirt and metal base allow better cooling around base pins. Also similar to QB3/300 and to 4-125A
Introduced by Amperex in 1952.

Weight 120 g / 4.23 oz
Information source
6155: K.H.Fischer
Karlheinz Fischer

6155: Valvo,Senderöhren, 1983
Anonymous 15 Collector

6155: Valvo,Senderöhren, 1983
Anonymous 15 Collector

from Just Qvigstad

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