Yes they do make a 6 volt version. The other co. I mentioned makes them only in 12 volt,but they also sell the 12 to 6 inverter for 6 volters like me.
But hey, one more radio question, sticky selector buttons, I have a middle one that wants to stay in after being pushed in. Push another button and it pops out. Any quick cures?. The electric cleaner I use warns against using with plastic,so I tried a little white grease under the key when it was pulled out, still sticks. Minor, but annoying.
Dale