[mikethedruid]

First advice, REMOVE THOSE BATTERIES IMMEDIATELY !!! Save them and measure them for size dimensions. but get them out of the radio. The 67 1/2 volt battery already shows signs of leakage, as does the 1 1/2 V battery. That is the cause of the discoloration. Check the battery clips well too to make sure they are not corroded. If they are, clean them with a baking soda and water paste to neutralize the battery acids. Without being able to measure the battery compartments I cannot give you more advice. You could use a regular D cell with an extender piece for the A battery, and 7 9 volt transistor radio batteries in series for the B battery if they will fit.