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ID = 17249
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Developer: GEC, General Electric Co.; London 
Tube type:  Transmitting Triode, air cooled   Text 
Identical to NT99 = E1232 = 4C27 = CV92 = CV1256 = W2514 = 8026 = REL7
Similar Tubes
Normally replaceable-slightly different:
Predecessor Tubes E1232  

Base Wires Sidecontact and top contact.
Was used by Radar
Filament Vf 6 Volts / If 6.5 Ampere / Half indirect

Micropup triode widely used in AMES11 50cm mobile ground radar, in Naval fire control systems and in airborne 200MHz equipment. Useful up to about 600MHz.
Admiralty service code for E1232 prototype.

Dimensions (WHD)
incl. pins / tip
x 133 x 52 mm / x 5.24 x 2.05 inch
Weight 197 g / 6.95 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
-- Original prospect or advert   Callick, Metres to Microwaves
The Saga of Marconi Osram Valve
NT99: Private collection
Emilio Ciardiello

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NT99: Manufacturer's Literature
Emilio Ciardiello

NT99: Manufacturer's Literature
Emilio Ciardiello

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