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ID = 17822
United States of America (USA)
Brand: Raytheon Mfg. Co.; Cambridge, MA
Tube type:  Half-Wave Vacuum Rectifier 
Identical to RK73 = RKR73 = 73 = CV2543
Similar Tubes
Normally replaceable-slightly different:

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Filament Vf 2.5 Volts / If 4.2 Ampere / Direct
Description Clipper diode. 13KV PIV, 30mA max dc. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
Tube Lore (I)   

rk73_sockel.png RK73: Raytheon Manual
Heinz Höger

Just Qvigstad
RK73: Raytheon Manual
Heinz Höger

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