Hi there, does anyone know how to add an input socket (3.5mm?) to an old portable battery radio. Basically I want to use a radio(that is small enough to carry in my toolbox) at work as an amp for my minidisc player. Can you jump on to the amplification side of the radio and disable the actual radio side. I know that all radios will be different, but before I get deeper into models etc I just want to know if it can be done and what help is available. TIA Disastermaster.