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It probably was a Filter Cap venting, probably not too much damage.
Depending on whether this is a Transformer set or a Voltage Doubler Power Supply it could just need new Caps, worst case is a burned transformer but usually takes out the 5U4 first.
If it uses a 5U4 Rectifier tube(s) you could remove it and power it up again briefly, if the heaters light and nothing smokes then the transformer is probably OK.
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