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ID = 48172
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Developer: GEC, General Electric Co.; London 
Tube type:  Pulse magnetron   SHF/EHF (>3 GHz) 
  Ca. 1925 up to 1945 very rare. ***
Identical to NT98A = CV1491
Predecessor Tubes NT98  
Successor Tubes CV56A  

Base Wires
Was used by Radar
Filament Vf 6 Volts / If 1.2 Ampere / Half indirect

This is one of the four frequency selections derived from NT98.

  • 3030 to 3060 MHz
  • 8 A at 9.5 kV input
  • 8 kW typical output pulses, 5 kW minimum.

NT98D was later listed as CV1491.

NT98 and its frequency variants are quite rare today because they were in the list of repairable tubes. When removed from service they had to be returned to a suitable repair shop to be repaired or to be scrapped for recovering precious metals, copper, tungsten and gold.

The development of the E1189 magnetron at GEC can be read at this link.

Information source -- Original-techn. papers.   
NT98A: Private collection
Emilio Ciardiello

NT98A: Manufacturer's Literature
Emilio Ciardiello

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