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There could be a short in other tubes such as the 12AV6 or 5OC5. Check where the other end of the burned resistors connect to.
You might try to get a schematic (most of these type radios are pretty similar in circuitry) and see exactly where the bad resistors connect in the circuit.
Some caps that are more modern paper caps (plastic encased) (early 1960's era) will look more modern but still suffer the paper cap degradation. I would go ahead and re-cap with brand new mylar caps.
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