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It may fire up with a recap and tube testing/replacement so you wouldn't really need a schematic. Usually they do unless they are hacked or have serious problems like burned interstage transformers and that sort of thing. If it doesn't fire up start checking resistors for drift, tube sockets for corrosion, etc., but they usually do. I'd just go for it. Long as you can read the values on the caps and replace with the same or close values.
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Summer's here and the time is right. 
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