Adding a blocking diode to prevent damaging non rechargable batteries and having them leak into your radio.
The Channel Master 6436-A schematic to the right shows the batteries connected directly to the output of the ac power supply through a 6.8 ohm resistor.
The lighted bulb in the picture to the right is an indicator of why the alkaline batteries I installed in my radio were leaking.
I chose to insert the diode on the positive battery connector because it is much easier to access with a soldering iron than the other terminal.
The three wires attached to the battery terminal need to be removed and attached to the diode.
The three wires that were removed from the battery connector are now attached to the cathode side of the diode.
The other side of the diode will be attached to the battery connector.
With the attached 1N4001 diode the power can flow from the batteries to the radio, but not from the radio power supply to the batteries.
The 1N4001 diode with a current rating of 1 amp and 50 volt dc blocking voltage will be more than adequate for this application.