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It could be that the capacitors are failing. I know that the paper capacitors in most Japanese tube sets were real lousy, but I'm not all that experienced with transistor stuff to know if they were an issue.
That looks like a VERY early transistor set, and likely S0ny's first model......As such it is likely to be quite valuable, and you may want to avoid tinkering with it as you could devalue it that way.
There are folks here that know a heck of a lot more about early transistor radios than me, who will have better advice to offer. I'll defer you to their expertise.....
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