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  BC652A  

SCR-506 = BC-652-A (receiver) & BC-653-A (transmitter) = Militairy Radio set, US 1941

Schematic Diagram as found on the bottom plate of the receiver.
Article from Radio Electronica 1971 # 10. (nl)
Power Supply Circuit for use at home mains supply
Photo of the top side of the modified power supply
Photo of the bottom side of the modified power supply
The circuit below shows how a tuning indicator can be connected