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ID = 16109
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Developer: GEC, General Electric Co.; London 
Tube type:  Pulse magnetron 
Identical to NT98 = E1189 = REL3D = W2510 = CV1255 = NTA98
Successor Tubes CV56A   CV56   NT98C   NT98A   NT98B   NT98D  

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

This is the Admiralty standardized code for the early S-band magnetron E1189. First use in March 1941 on the HMS Orchis corvette. 10 kW typical peak power, 5 kW minimum at 10 cm.

Later in 1941 it originated four frequency selections, identified by A, B, C or D suffix indicating the operating frequency.

NT98 was used in the Naval radar Type 271.

Manufactured by GEC and BTH in Britain. NT98 was also manufactured overseas by manufacturers related to Bell Telephone. In Canada it was produced by Northern Electric as REL Type 3D, while in Australia it was made by Standard Telephone and Cables as NTA98.

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

Information source Taschenbuch zum Röhren-Codex 1948/49   
-- Original prospect or advert   Callick, Metres to Microwaves.
NT98: Private collection
Emilio Ciardiello


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