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ID = 29048
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Developer: Bell Labs; Murray Hill, NJ. 
Tube type:  Transmitting Tetrode, air cooled 
Identical to 5D21 = P552/1E = CV427
Similar Tubes
Normally replaceable-slightly different:
  4PR60B ; 715C ; C1149 ; OSW2027 ; VX7016
Multiple differences or of other kind:
Predecessor Tubes 715B  
Successor Tubes 426XQ  

Base Medium 4-pin, ceramic disc Top contact with a cap.
Was used by Radar
Filament Vf 26 Volts / If 2.1 Ampere / Half indirect

Pulse power tetrode intended for radar modulators. Uprated 715B with corona guarding ring on plate cap. Grid top cooling fins removed and cooling provided by copper connections to the base pins. 20 kV, 15 A peak, 60 W average pulse handling capability. Heaters designed to operate directly from the aircraft storage battery, between 22 and 28.5 V.
Could be replaced by 715C.
Also made by Raytheon, RCA, STC.

Dimensions (WHD)
incl. pins / tip
65 x 149 x mm / 2.56 x 5.87 x inch
Information source Tube Lore (I)   
-- Original-techn. papers.   BSTJ

5d21_zoc_a.png 5D21: Manuale delle valvole
Giuseppe Antonio Tusini

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Just Qvigstad
5D21: Manuale delle valvole
Giuseppe Antonio Tusini

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Usage in Models 1= 1943??

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

Collection of



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