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ID = 17489
Tube type:  Transmitting Triode, air cooled 
Identical to 4304B = 304B = CV2760 = UH50
Similar Tubes
Other base:
  4304BB ; 4304CB

Base UX-Base (4 Pins (2 thick, USA 1924, UX) 2 Top contacts.
Filament Vf 7.5 Volts / If 3.25 Ampere / Direct

High-frequency transmitting triode capable of operation up to 300MHz. 50W plate dissipation.
Designed by Western Electric was used in 1938 in the British airborne radar prototypes by the team of E. G. Bowen. Later produced by STC also with British 4-pin base, as 4034BB.

Information source - - Manufacturers Literature   
-- Original-techn. papers.   E.G.Bowen, Radar Days, pg.50
4304B: High Frequency Thermionic Tubes, A.F. Harvey
Achim Dassow

4304B: Manufacturer's Literature
Emilio Ciardiello


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