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4X250B

Information - Help 
ID = 22532
       
Country:
United States of America (USA)
Brand: Eimac (brand name)
Tube type:  Transmitting Tetrode, air cooled   beam power   Power/Output 
Identical to 4X250B = QEL2/250 = CV2487

Base SPECIAL TUBEBASE in general Top contact with a cap.
Filament Vf 6 Volts / If 2.6 Ampere / Indirect
Description Power grid tube with special 9 pin base.
Pa <250W, Va <2000. Audio and RF use up to 500 MHz. This was the most sold transmitting tube because it was cheap. It was used in the WW2 up to about 1980 and production was fully automatic (carousel) - material in - tube out! (EE: Information from Mr. Ackeret, Varian) 
Dimensions (WHD)
incl. pins / tip
42 x 61 x mm / 1.65 x 2.40 x inch
Information source
 
eimac_4x250b.jpg
4X250B
Otto Frosinn

 
4x250b_sock.png
4X250B: Valvo,Senderöhren, 1983
Anonymous 15 Collector

 
4x250b_spec.png
4X250B: Valvo,Senderöhren, 1983
Anonymous 15 Collector


Usage in Models 1= 1957?? ; 1= 1964??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2


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