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Determining the amperage output of transformers?

I have two giant audio transformers that put out about 70 volts each.
I want to determine what the maximum amount of current they can supply is, because they're really nice transformers, and I wouldn't want to break them by over-heating them. Is there any way to do this mathmatically? I have a multimeter that can measure ohms and voltage, but it can't measure watts, and the fuses for the ammeter are blown, and I can't replace them right now.
Bear in mind that this is about as much as I know about the transformers, other than they're heavy, and that primaries are 120 volts each.

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