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All of those radios that used subminiature tubes are rare. Some of them were actually of hybrid design, meaning they used tubes and transistors. Since yours has 3 tubes, it's possible that it uses transistors for the audio output stage. I think some of those old batteries are still available; but, they are expensive. I always get around that problem by substituting a combination of modern batteries. To get the 45 volts, just wire 5 nine volt transistor batteries in series. The 1.5 volt battery may still be available at a reasonable price.
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