UHF/Microwave Devices
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This Tube is made by the Raytheon Mfg. Co. for the Marconi Co. Tube has the number RK-5657 and serial number B0443E stamped on it.



2j56a Raytheon magnetron


 

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Label reads "Raytheon RK2J34,
Made in U.S.A., serial no. L2654E


4J26 Large Lo frequency Magnetron!

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