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If you don't know which set of wires are the primary I'd be leery of connecting it.
If this is for a tube based deck, one of the secondaries should be 6.3V or 12.6V (check tube types/tube data and heater wiring to know which). Connect the heater secondary (lowest resistance) to a heater winding of the same voltage on another transformer. The winding of your replacement transformer that produces closest to 120VAC is the primary...You can measure the other secondaries while you are at it.
Take care while measuring the secondaries. The line and B+ secondaries can produce lethal voltage and current. Keep one hand in your pocket and don't touch any metal or concrete while measuring it. I've done a LOT of work with mystery transformers like I describe, and not got hurt, but I did not do anything stupid.
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