|electron Tube Data sheets
|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