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If you need a 3-terminal vibrator, negative ground, here is a circuit that works. I bought a vibrator (from a well-known company) to replace an old vibrator and it burned out immediately. After I replaced the components with new ones, it exploded again. So I decided to build one myself. Here the results, it operates perfectly. I use it for a 12V car-radio but it should also work with a 6 Volt radio except the 12V regulator may have too much voltage drop for starting. (When running the voltage is doubled by the transformer in the radio.) Maybe the voltage regulator needs to be replaced bij something else. I did not test it on a 6 Volt radio. B.t.w.: the FETs will probably need a small heatsink.
Circuit diagram
Components List