Welcome to the forum. I'm sure some of the guys here have worked on those and can give you Ideas. With anything of that vintage, electrolyic capacitors are very suspect and should be changed. As well as any paper caps. If any transitors are bad that coud be a challenge to find equivalents that will work. They are probably Germanium, I don't think you can subsitute modern silicon ones in most circuits. definitely a collectable set. I passed up a couple opprotunities to pick one up cheap in the past, wish I had bought them.
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