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ID = 53741
Great Britain (UK)
Brand: EMI; Hayes, Middlesex
Tube type:  Reflex Klystron   SHF/EHF (>3 GHz) 
Identical to R9561

Was used by Radar
Filament Vf 6.3 Volts / If 0.7 Ampere / Half indirect

Similar to R5222, the 7-pin B7G base being be modified to fit wide range WG-flanged external cavities.

Depending upon the external cavity, it could be used as local oscillator in X-band radar receivers or up to 11 GHz, as pump oscillator in S-band parametric amplifiers.

Information source - - Manufacturers Literature   
Emilio Ciardiello


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